From 5a526a7955f59750b47e46b82a07e5dd589a02ec Mon Sep 17 00:00:00 2001
From: Jeff <3242284158@qq.com>
Date: Sat, 12 Sep 2026 09:55:52 +0800
Subject: [PATCH 1/3] add_exercises

---
 content/chapter-02-stack-queue/00-overview.md |   7 +-
 .../E-02-09-bracket-matching/Makefile         |   3 +
 .../E-02-09-bracket-matching/README.md        |  75 ++++++
 .../E-02-09-bracket-matching/lab.json         |  33 +++
 .../solution/main.cpp                         |  25 ++
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 .../E-02-09-bracket-matching/tests/cases.json | 227 ++++++++++++++++++
 .../exercise/E-02-10-rpn-evaluation/Makefile  |   3 +
 .../exercise/E-02-10-rpn-evaluation/README.md |  77 ++++++
 .../exercise/E-02-10-rpn-evaluation/lab.json  |  33 +++
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 .../E-02-10-rpn-evaluation/tests/cases.json   | 227 ++++++++++++++++++
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 .../E-02-11-infix-to-postfix/tests/cases.json | 227 ++++++++++++++++++
 .../E-02-12-next-greater-element/Makefile     |   3 +
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 .../E-02-12-next-greater-element/lab.json     |  33 +++
 .../solution/main.cpp                         |  15 ++
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 create mode 100644 labs/chapter-02/exercise/E-02-20-stock-span/Makefile
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 create mode 100644 labs/chapter-02/exercise/E-02-20-stock-span/lab.json
 create mode 100644 labs/chapter-02/exercise/E-02-20-stock-span/solution/main.cpp
 create mode 100644 labs/chapter-02/exercise/E-02-20-stock-span/student/main.cpp
 create mode 100644 labs/chapter-02/exercise/E-02-20-stock-span/tests/001-sample.in
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 create mode 100644 labs/chapter-02/exercise/E-02-20-stock-span/tests/004-boundary.in
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 create mode 100644 labs/chapter-02/exercise/E-02-20-stock-span/tests/005-boundary.in
 create mode 100644 labs/chapter-02/exercise/E-02-20-stock-span/tests/005-boundary.out
 create mode 100644 labs/chapter-02/exercise/E-02-20-stock-span/tests/006-normal.in
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diff --git a/content/chapter-02-stack-queue/00-overview.md b/content/chapter-02-stack-queue/00-overview.md
index cb9faf2f..7f5eb4ab 100644
--- a/content/chapter-02-stack-queue/00-overview.md
+++ b/content/chapter-02-stack-queue/00-overview.md
@@ -40,7 +40,7 @@ status: "draft"
 1. 先学习[栈](./01-stack.md)，建立“后进先出 + 表尾操作”的模型，再完成[Lab 02-T-01：栈选择题精练](../../labs/chapter-02/theory/T-02-01-stack-quiz/README.md)检查基础概念。
 2. 再学习[队列](./02-queue.md)，重点理解循环队列判空判满的边界约定，再完成[Lab 02-T-02：队列选择题精练](../../labs/chapter-02/theory/T-02-02-queue-quiz/README.md)检查公式应用与实现取舍。
 3. 完成基础实现练习：先做栈序列与最小栈，再做队列窗口、循环结构和用栈实现队列。
-4. 接着学习[应用](./03-applications.md)，完成其中的逆波兰表达式求值例题，并用 Lab 02-09 与 02-10 练习单调队列、单调栈与边界计算。
+4. 接着学习[应用](./03-applications.md)，完成逆波兰表达式求值、中缀转后缀、单调栈与逐层扩散练习。
 5. 最后依次完成可撤销浏览器、超市收银模拟与停车场管理三个综合 Lab。
 
 ## 配套 Labs
@@ -52,12 +52,15 @@ status: "draft"
 | 栈的模拟与接口实现 | [02-03 验证栈序列](../../labs/chapter-02/exercise/E-02-01-validate-stack-sequences/README.md)、[02-04 最小栈](../../labs/chapter-02/exercise/E-02-02-min-stack/README.md) | 从基础模拟推进到常数时间辅助状态维护 |
 | 队列的窗口与接口实现 | [02-05 最近请求](../../labs/chapter-02/exercise/E-02-03-recent-counter/README.md)、[02-06 循环队列](../../labs/chapter-02/exercise/E-02-04-circular-queue/README.md)、[02-07 用栈实现队列](../../labs/chapter-02/exercise/E-02-05-queue-using-stacks/README.md)、[02-08 循环双端队列](../../labs/chapter-02/exercise/E-02-06-circular-deque/README.md) | 掌握滑动窗口、环绕下标、摊还分析和两端操作 |
 | 单调结构进阶 | [02-09 滑动窗口最大值](../../labs/chapter-02/exercise/E-02-07-sliding-window-maximum/README.md)、[02-10 柱状图最大矩形](../../labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/README.md) | 维护候选单调性，处理窗口过期和左右边界 |
+| 表达式与匹配 | [Lab 02-E-09：括号匹配](../../labs/chapter-02/exercise/E-02-09-bracket-matching/README.md)、[Lab 02-E-10：逆波兰表达式求值](../../labs/chapter-02/exercise/E-02-10-rpn-evaluation/README.md)、[Lab 02-E-11：中缀表达式转后缀](../../labs/chapter-02/exercise/E-02-11-infix-to-postfix/README.md) | 检验嵌套匹配、操作数顺序、优先级和括号边界 |
+| 单调栈与逐层扩散 | [Lab 02-E-12：下一个更大元素](../../labs/chapter-02/exercise/E-02-12-next-greater-element/README.md)、[Lab 02-E-13：下一个更小元素](../../labs/chapter-02/exercise/E-02-13-next-smaller-element/README.md)、[Lab 02-E-14：农夫抓牛](../../labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/README.md)、[Lab 02-E-20：股票价格跨度](../../labs/chapter-02/exercise/E-02-20-stock-span/README.md) | 维护单调候选，并用 FIFO 保证按层最短路径 |
+| 队列与栈应用 | [Lab 02-E-15：Josephus 出列顺序](../../labs/chapter-02/exercise/E-02-15-josephus-order/README.md)、[Lab 02-E-16：队列生成二进制数](../../labs/chapter-02/exercise/E-02-16-binary-number-queue/README.md)、[Lab 02-E-17：双端队列回文检查](../../labs/chapter-02/exercise/E-02-17-palindrome-deque/README.md)、[Lab 02-E-18：反转队列前 K 个元素](../../labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/README.md)、[Lab 02-E-19：仅用辅助栈排序](../../labs/chapter-02/exercise/E-02-19-stack-sorting/README.md) | 练习循环调度、FIFO 生成、双端访问和辅助结构协作 |
 | 栈、导航历史与 Undo/Redo | [Lab 02-P-01：可撤销浏览器](../../labs/chapter-02/project/P-02-01-undoable-browser/README.md) | 用完整页面状态协调后退、前进和页面级命令历史 |
 | FIFO、多队列与离散时间 | [Lab 02-P-02：超市收银模拟](../../labs/chapter-02/project/P-02-02-supermarket-checkout/README.md) | 统一时间口径，验证等待、逗留、忙碌率和队列峰值 |
 | 栈与队列联动 | [Lab 02-P-03：停车场管理](../../labs/chapter-02/project/P-02-03-parking-lot-management/README.md) | 完成倒车、便道补位、中间删除与统计 |
 
 ::: info Lab 编号说明
-Lab 02-01 与 Lab 02-02 是交互式概念自测；Lab 02-03 至 Lab 02-10 是带起始代码、参考实现和 100 分自动测试的 Program Lab；Lab 02-11 至 Lab 02-13 是综合 Project 规格，目前仍需学习者按任务说明自行创建实现。侧栏按 Theory、Exercise、Project 分类展示。
+Lab 02-01 与 Lab 02-02 是交互式概念自测；20 道 Exercise 均带起始代码、参考实现和 100 分自动测试；3 道 Project 用于综合建模。侧栏按 Theory、Exercise、Project 分类展示。
 :::
 
 ## 学习建议
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/Makefile b/labs/chapter-02/exercise/E-02-09-bracket-matching/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/README.md b/labs/chapter-02/exercise/E-02-09-bracket-matching/README.md
new file mode 100644
index 00000000..88353655
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/README.md
@@ -0,0 +1,75 @@
+---
+title: "Lab 02-E-09：括号匹配"
+description: "用栈验证多种括号的嵌套关系。"
+order: 20
+chapter: 2
+labId: "02E09"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-09：括号匹配
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+用栈验证多种括号的嵌套关系。
+
+## 输入格式
+
+字符串 `s`，仅含 ASCII 非空白字符，可含括号与普通字符；空字符串不作为输入。
+
+## 输出格式
+
+括号是否完全匹配：`YES` 或 `NO`。
+
+## 数据范围与限制
+
+- 输入规模不超过 `200000`，除题面另有说明外整数使用 64 位有符号范围。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法应为线性或摊还线性时间，辅助空间不超过 `O(n)`。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-09-bracket-matching
+pnpm lab:run -- labs/chapter-02/exercise/E-02-09-bracket-matching
+pnpm lab:score -- labs/chapter-02/exercise/E-02-09-bracket-matching
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/lab.json b/labs/chapter-02/exercise/E-02-09-bracket-matching/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/solution/main.cpp b/labs/chapter-02/exercise/E-02-09-bracket-matching/solution/main.cpp
new file mode 100644
index 00000000..f8193fbc
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/solution/main.cpp
@@ -0,0 +1,25 @@
+#include <iostream>
+#include <stack>
+#include <string>
+
+bool matches(char left, char right) {
+    return (left == '(' && right == ')') || (left == '[' && right == ']') ||
+           (left == '{' && right == '}');
+}
+
+int main() {
+    std::string text;
+    if (!(std::cin >> text)) return 0;
+    std::stack<char> pending;
+    for (char ch : text) {
+        if (ch == '(' || ch == '[' || ch == '{') pending.push(ch);
+        else if (ch == ')' || ch == ']' || ch == '}') {
+            if (pending.empty() || !matches(pending.top(), ch)) {
+                std::cout << "NO\n";
+                return 0;
+            }
+            pending.pop();
+        }
+    }
+    std::cout << (pending.empty() ? "YES" : "NO") << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/student/main.cpp b/labs/chapter-02/exercise/E-02-09-bracket-matching/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/001-sample.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/001-sample.in
new file mode 100644
index 00000000..6a452c18
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/001-sample.in
@@ -0,0 +1 @@
+()
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/001-sample.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/001-sample.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/001-sample.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/002-boundary.in
new file mode 100644
index 00000000..9d32875d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/002-boundary.in
@@ -0,0 +1 @@
+([]{})
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/002-boundary.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/002-boundary.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/003-boundary.in
new file mode 100644
index 00000000..75efa8c7
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/003-boundary.in
@@ -0,0 +1 @@
+([)]
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/003-boundary.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/003-boundary.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/004-boundary.in
new file mode 100644
index 00000000..2d06f376
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/004-boundary.in
@@ -0,0 +1 @@
+(
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/004-boundary.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/004-boundary.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/005-boundary.in
new file mode 100644
index 00000000..bea8cd17
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/005-boundary.in
@@ -0,0 +1 @@
+)
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/005-boundary.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/005-boundary.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/005-boundary.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/006-normal.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/006-normal.in
new file mode 100644
index 00000000..8baef1b4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/006-normal.in
@@ -0,0 +1 @@
+abc
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/006-normal.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/006-normal.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/006-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/007-normal.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/007-normal.in
new file mode 100644
index 00000000..c68423d3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/007-normal.in
@@ -0,0 +1 @@
+a(b[c]{d})
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/007-normal.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/007-normal.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/007-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/008-normal.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/008-normal.in
new file mode 100644
index 00000000..6b534fff
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/008-normal.in
@@ -0,0 +1 @@
+{[()]}
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/008-normal.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/008-normal.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/008-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/009-normal.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/009-normal.in
new file mode 100644
index 00000000..1e9bae17
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/009-normal.in
@@ -0,0 +1 @@
+{[(])}
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/009-normal.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/009-normal.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/009-normal.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/010-normal.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/010-normal.in
new file mode 100644
index 00000000..8485180c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/010-normal.in
@@ -0,0 +1 @@
+(((())))
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/010-normal.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/010-normal.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/010-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/011-normal.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/011-normal.in
new file mode 100644
index 00000000..833f4ee6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/011-normal.in
@@ -0,0 +1 @@
+[[]]{}
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/011-normal.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/011-normal.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/011-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/012-normal.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/012-normal.in
new file mode 100644
index 00000000..8289d3dd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/012-normal.in
@@ -0,0 +1 @@
+([{}])x
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/012-normal.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/012-normal.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/012-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/013-normal.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/013-normal.in
new file mode 100644
index 00000000..74d7e510
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/013-normal.in
@@ -0,0 +1 @@
+((())
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/013-normal.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/013-normal.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/013-normal.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/014-normal.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/014-normal.in
new file mode 100644
index 00000000..9f93cf02
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/014-normal.in
@@ -0,0 +1 @@
+())(
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/014-normal.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/014-normal.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/014-normal.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/015-normal.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/015-normal.in
new file mode 100644
index 00000000..98232c64
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/015-normal.in
@@ -0,0 +1 @@
+{
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/015-normal.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/015-normal.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/015-normal.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/016-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/016-regression.in
new file mode 100644
index 00000000..5c34318c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/016-regression.in
@@ -0,0 +1 @@
+}
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/016-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/016-regression.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/016-regression.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/017-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/017-regression.in
new file mode 100644
index 00000000..e4db21bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/017-regression.in
@@ -0,0 +1 @@
+a[b(c)d]e
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/017-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/017-regression.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/017-regression.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/018-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/018-regression.in
new file mode 100644
index 00000000..3edf676a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/018-regression.in
@@ -0,0 +1 @@
+a[b(c}d]e
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/018-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/018-regression.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/018-regression.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/019-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/019-regression.in
new file mode 100644
index 00000000..10b3a6be
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/019-regression.in
@@ -0,0 +1 @@
+(([]){})
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/019-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/019-regression.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/019-regression.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/020-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/020-regression.in
new file mode 100644
index 00000000..b312bcbe
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/020-regression.in
@@ -0,0 +1 @@
+([{}])[]
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/020-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/020-regression.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/020-regression.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.in
new file mode 100644
index 00000000..d8e343f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.in
@@ -0,0 +1 @@
+([{}])][
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.in
new file mode 100644
index 00000000..2ddb7ff5
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.in
@@ -0,0 +1 @@
+x(y[z]w)v
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.in
new file mode 100644
index 00000000..8de0b4b5
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.in
@@ -0,0 +1 @@
+x(y[z}w)v
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.in
new file mode 100644
index 00000000..fcd62c66
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.in
@@ -0,0 +1 @@
+((((((((()))))))))
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.in
new file mode 100644
index 00000000..708fe8f0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.in
@@ -0,0 +1 @@
+[({})](
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/cases.json b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/Makefile b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/README.md b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/README.md
new file mode 100644
index 00000000..b8918618
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/README.md
@@ -0,0 +1,77 @@
+---
+title: "Lab 02-E-10：逆波兰表达式求值"
+description: "用操作数栈处理二元运算与非法表达式。"
+order: 21
+chapter: 2
+labId: "02E10"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-10：逆波兰表达式求值
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+用操作数栈处理二元运算与非法表达式。
+
+## 输入格式
+
+第一行 token 数 `n`；第二行包含恰好 `n` 个、以空白分隔的整数或 `+ - * /` token；当 `n=0` 时第二行为空。
+
+## 输出格式
+
+合法表达式输出整数结果，否则输出 `ERROR`。
+
+## 数据范围与限制
+
+- 输入规模不超过 `200000`，除题面另有说明外整数使用 64 位有符号范围。
+- `0 <= n <= 200000`；每个操作数和每次运算结果都必须落在 64 位有符号整数范围内，保证不会发生溢出。
+- 除数为 `0`、操作数不足或最终栈中不是恰好一个结果时，输出 `ERROR`。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法应为线性或摊还线性时间，辅助空间不超过 `O(n)`。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-10-rpn-evaluation
+pnpm lab:run -- labs/chapter-02/exercise/E-02-10-rpn-evaluation
+pnpm lab:score -- labs/chapter-02/exercise/E-02-10-rpn-evaluation
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/lab.json b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/solution/main.cpp b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/solution/main.cpp
new file mode 100644
index 00000000..8944f1ee
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/solution/main.cpp
@@ -0,0 +1,36 @@
+#include <cstddef>
+#include <iostream>
+#include <string>
+#include <vector>
+
+bool integerToken(const std::string& token, long long& value) {
+    try {
+        std::size_t used = 0;
+        value = std::stoll(token, &used);
+        return used == token.size();
+    } catch (...) { return false; }
+}
+
+int main() {
+    std::size_t n = 0;
+    if (!(std::cin >> n)) return 0;
+    std::vector<long long> values;
+    bool valid = true;
+    for (std::size_t i = 0; i < n; ++i) {
+        std::string token;
+        std::cin >> token;
+        if (!valid) continue;
+        long long value = 0;
+        if (integerToken(token, value)) { values.push_back(value); continue; }
+        if ((token != "+" && token != "-" && token != "*" && token != "/") || values.size() < 2) { valid = false; continue; }
+        const long long right = values.back(); values.pop_back();
+        const long long left = values.back(); values.pop_back();
+        if (token == "+") values.push_back(left + right);
+        else if (token == "-") values.push_back(left - right);
+        else if (token == "*") values.push_back(left * right);
+        else if (right == 0) valid = false;
+        else values.push_back(left / right);
+    }
+    if (!valid || values.size() != 1) std::cout << "ERROR\n";
+    else std::cout << values.back() << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/student/main.cpp b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/001-sample.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/001-sample.in
new file mode 100644
index 00000000..4ccde532
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/001-sample.in
@@ -0,0 +1,2 @@
+5
+2 1 + 3 *
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/001-sample.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/001-sample.out
new file mode 100644
index 00000000..ec635144
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/001-sample.out
@@ -0,0 +1 @@
+9
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/002-boundary.in
new file mode 100644
index 00000000..df85a17b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/002-boundary.in
@@ -0,0 +1,2 @@
+5
+4 13 5 / +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/002-boundary.out
new file mode 100644
index 00000000..1e8b3149
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/002-boundary.out
@@ -0,0 +1 @@
+6
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/003-boundary.in
new file mode 100644
index 00000000..7ba59a03
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/003-boundary.in
@@ -0,0 +1,2 @@
+3
+8 3 -
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/003-boundary.out
new file mode 100644
index 00000000..7ed6ff82
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/003-boundary.out
@@ -0,0 +1 @@
+5
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/004-boundary.in
new file mode 100644
index 00000000..ab3c946d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/004-boundary.in
@@ -0,0 +1,2 @@
+3
+-3 -2 *
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/004-boundary.out
new file mode 100644
index 00000000..1e8b3149
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/004-boundary.out
@@ -0,0 +1 @@
+6
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/005-boundary.in
new file mode 100644
index 00000000..79ac02e8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/005-boundary.in
@@ -0,0 +1,2 @@
+2
+1 +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/005-boundary.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/005-boundary.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/005-boundary.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/006-normal.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/006-normal.in
new file mode 100644
index 00000000..09a90ac1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/006-normal.in
@@ -0,0 +1,2 @@
+3
+4 0 /
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/006-normal.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/006-normal.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/006-normal.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/007-normal.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/007-normal.in
new file mode 100644
index 00000000..a789e877
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/007-normal.in
@@ -0,0 +1,2 @@
+2
+1 2
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/007-normal.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/007-normal.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/007-normal.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/008-normal.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/008-normal.in
new file mode 100644
index 00000000..0ab8d200
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/008-normal.in
@@ -0,0 +1,2 @@
+1
++
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/008-normal.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/008-normal.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/008-normal.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/009-normal.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/009-normal.in
new file mode 100644
index 00000000..90ec29d6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/009-normal.in
@@ -0,0 +1,2 @@
+13
+10 6 9 3 + -11 * / * 17 + 5 +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/009-normal.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/009-normal.out
new file mode 100644
index 00000000..2bd5a0a9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/009-normal.out
@@ -0,0 +1 @@
+22
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/010-normal.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/010-normal.in
new file mode 100644
index 00000000..ce6ef18a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/010-normal.in
@@ -0,0 +1,2 @@
+15
+15 7 1 1 + - / 3 * 2 1 1 + + -
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/010-normal.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/010-normal.out
new file mode 100644
index 00000000..7ed6ff82
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/010-normal.out
@@ -0,0 +1 @@
+5
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/011-normal.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/011-normal.in
new file mode 100644
index 00000000..ba96e434
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/011-normal.in
@@ -0,0 +1,2 @@
+9
+5 1 2 + 4 * + 3 -
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/011-normal.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/011-normal.out
new file mode 100644
index 00000000..8351c193
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/011-normal.out
@@ -0,0 +1 @@
+14
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/012-normal.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/012-normal.in
new file mode 100644
index 00000000..02da3b3c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/012-normal.in
@@ -0,0 +1,2 @@
+3
+7 2 /
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/012-normal.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/012-normal.out
new file mode 100644
index 00000000..00750edc
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/012-normal.out
@@ -0,0 +1 @@
+3
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/013-normal.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/013-normal.in
new file mode 100644
index 00000000..ff525412
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/013-normal.in
@@ -0,0 +1,2 @@
+3
+-7 2 /
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/013-normal.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/013-normal.out
new file mode 100644
index 00000000..a83d1d52
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/013-normal.out
@@ -0,0 +1 @@
+-3
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/014-normal.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/014-normal.in
new file mode 100644
index 00000000..ae14ceff
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/014-normal.in
@@ -0,0 +1,2 @@
+5
+100 20 / 3 +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/014-normal.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/014-normal.out
new file mode 100644
index 00000000..45a4fb75
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/014-normal.out
@@ -0,0 +1 @@
+8
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/015-normal.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/015-normal.in
new file mode 100644
index 00000000..6e137daa
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/015-normal.in
@@ -0,0 +1,2 @@
+5
+9 9 * 2 /
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/015-normal.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/015-normal.out
new file mode 100644
index 00000000..425151f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/015-normal.out
@@ -0,0 +1 @@
+40
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/016-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/016-regression.in
new file mode 100644
index 00000000..0513ca5c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/016-regression.in
@@ -0,0 +1,2 @@
+4
+1 2 + +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/016-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/016-regression.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/016-regression.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/017-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/017-regression.in
new file mode 100644
index 00000000..b763bfdf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/017-regression.in
@@ -0,0 +1,2 @@
+4
+1 2 ? +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/017-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/017-regression.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/017-regression.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/018-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/018-regression.in
new file mode 100644
index 00000000..8da61788
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/018-regression.in
@@ -0,0 +1,2 @@
+7
+6 2 / 3 - 4 *
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/018-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/018-regression.out
new file mode 100644
index 00000000..573541ac
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/018-regression.out
@@ -0,0 +1 @@
+0
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/019-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/019-regression.in
new file mode 100644
index 00000000..da2ceaff
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/019-regression.in
@@ -0,0 +1,2 @@
+7
+20 3 / 2 * 1 +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/019-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/019-regression.out
new file mode 100644
index 00000000..b1bd38b6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/019-regression.out
@@ -0,0 +1 @@
+13
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/020-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/020-regression.in
new file mode 100644
index 00000000..77b5ce66
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/020-regression.in
@@ -0,0 +1,2 @@
+5
+0 5 - 2 *
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/020-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/020-regression.out
new file mode 100644
index 00000000..29167035
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/020-regression.out
@@ -0,0 +1 @@
+-10
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.in
new file mode 100644
index 00000000..339b3730
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.in
@@ -0,0 +1,2 @@
+5
+8 -3 / 2 +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.out
new file mode 100644
index 00000000..573541ac
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.out
@@ -0,0 +1 @@
+0
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.in
new file mode 100644
index 00000000..192e9d9a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.in
@@ -0,0 +1,2 @@
+1
+42
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.out
new file mode 100644
index 00000000..d81cc071
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.out
@@ -0,0 +1 @@
+42
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.in
new file mode 100644
index 00000000..e32a37e2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.in
@@ -0,0 +1,2 @@
+4
+1 2 3 +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.in
new file mode 100644
index 00000000..f73cfe71
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.in
@@ -0,0 +1,2 @@
+7
+3 4 + 2 * 7 /
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.out
new file mode 100644
index 00000000..0cfbf088
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.out
@@ -0,0 +1 @@
+2
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.in
new file mode 100644
index 00000000..4b51a392
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.in
@@ -0,0 +1,2 @@
+5
+16 2 2 * +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.out
new file mode 100644
index 00000000..209e3ef4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.out
@@ -0,0 +1 @@
+20
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/cases.json b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/Makefile b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/README.md b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/README.md
new file mode 100644
index 00000000..6abf8e41
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/README.md
@@ -0,0 +1,75 @@
+---
+title: "Lab 02-E-11：中缀表达式转后缀"
+description: "用调度场算法处理优先级、左结合和括号。"
+order: 22
+chapter: 2
+labId: "02E11"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-11：中缀表达式转后缀
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+用调度场算法处理优先级、左结合和括号。
+
+## 输入格式
+
+一行无空格表达式；操作数为单字符 ASCII 字母或数字，运算符仅允许 `+ - * /`，并允许使用圆括号 `(`、`)`。不要求处理一元运算符。
+
+## 输出格式
+
+合法时输出后缀表达式，非法时输出 `ERROR`。
+
+## 数据范围与限制
+
+- 输入规模不超过 `200000`，除题面另有说明外整数使用 64 位有符号范围。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法应为线性或摊还线性时间，辅助空间不超过 `O(n)`。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-11-infix-to-postfix
+pnpm lab:run -- labs/chapter-02/exercise/E-02-11-infix-to-postfix
+pnpm lab:score -- labs/chapter-02/exercise/E-02-11-infix-to-postfix
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/lab.json b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/solution/main.cpp b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/solution/main.cpp
new file mode 100644
index 00000000..4a6bed56
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/solution/main.cpp
@@ -0,0 +1,40 @@
+#include <cctype>
+#include <iostream>
+#include <stack>
+#include <string>
+
+bool op(char ch) { return ch == '+' || ch == '-' || ch == '*' || ch == '/'; }
+int priority(char ch) { return (ch == '*' || ch == '/') ? 2 : 1; }
+
+int main() {
+    std::string expression;
+    if (!(std::cin >> expression)) return 0;
+    std::stack<char> operators;
+    std::string output;
+    bool expectOperand = true;
+    bool valid = true;
+    for (char ch : expression) {
+        if (std::isalnum(static_cast<unsigned char>(ch))) {
+            if (!expectOperand) { valid = false; break; }
+            output += ch; expectOperand = false;
+        } else if (ch == '(') {
+            if (!expectOperand) { valid = false; break; }
+            operators.push(ch);
+        } else if (ch == ')') {
+            if (expectOperand) { valid = false; break; }
+            while (!operators.empty() && operators.top() != '(') { output += operators.top(); operators.pop(); }
+            if (operators.empty()) { valid = false; break; }
+            operators.pop();
+        } else if (op(ch)) {
+            if (expectOperand) { valid = false; break; }
+            while (!operators.empty() && operators.top() != '(' && priority(operators.top()) >= priority(ch)) { output += operators.top(); operators.pop(); }
+            operators.push(ch); expectOperand = true;
+        } else { valid = false; break; }
+    }
+    if (expectOperand) valid = false;
+    while (valid && !operators.empty()) {
+        if (operators.top() == '(') { valid = false; break; }
+        output += operators.top(); operators.pop();
+    }
+    std::cout << (valid ? output : "ERROR") << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/student/main.cpp b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/001-sample.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/001-sample.in
new file mode 100644
index 00000000..9b7d5e5b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/001-sample.in
@@ -0,0 +1 @@
+a+b*c
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/001-sample.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/001-sample.out
new file mode 100644
index 00000000..fdeb9c47
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/001-sample.out
@@ -0,0 +1 @@
+abc*+
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/002-boundary.in
new file mode 100644
index 00000000..8b00c1ee
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/002-boundary.in
@@ -0,0 +1 @@
+(a+b)*c
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/002-boundary.out
new file mode 100644
index 00000000..e48193bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/002-boundary.out
@@ -0,0 +1 @@
+ab+c*
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/003-boundary.in
new file mode 100644
index 00000000..3b26186d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/003-boundary.in
@@ -0,0 +1 @@
+a*(b+c)
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/003-boundary.out
new file mode 100644
index 00000000..29742127
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/003-boundary.out
@@ -0,0 +1 @@
+abc+*
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/004-boundary.in
new file mode 100644
index 00000000..b0d94ba4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/004-boundary.in
@@ -0,0 +1 @@
+a+b*c-d/e
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/004-boundary.out
new file mode 100644
index 00000000..f298e01d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/004-boundary.out
@@ -0,0 +1 @@
+abc*+de/-
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/005-boundary.in
new file mode 100644
index 00000000..78981922
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/005-boundary.in
@@ -0,0 +1 @@
+a
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/005-boundary.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/005-boundary.out
new file mode 100644
index 00000000..78981922
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/005-boundary.out
@@ -0,0 +1 @@
+a
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/006-normal.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/006-normal.in
new file mode 100644
index 00000000..b03e7409
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/006-normal.in
@@ -0,0 +1 @@
+(a)
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/006-normal.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/006-normal.out
new file mode 100644
index 00000000..78981922
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/006-normal.out
@@ -0,0 +1 @@
+a
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/007-normal.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/007-normal.in
new file mode 100644
index 00000000..94a54f3d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/007-normal.in
@@ -0,0 +1 @@
+a+b
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/007-normal.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/007-normal.out
new file mode 100644
index 00000000..d9148b29
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/007-normal.out
@@ -0,0 +1 @@
+ab+
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/008-normal.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/008-normal.in
new file mode 100644
index 00000000..ec4d9e62
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/008-normal.in
@@ -0,0 +1 @@
+a-b-c
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/008-normal.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/008-normal.out
new file mode 100644
index 00000000..ac77c501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/008-normal.out
@@ -0,0 +1 @@
+ab-c-
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/009-normal.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/009-normal.in
new file mode 100644
index 00000000..c76aadf4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/009-normal.in
@@ -0,0 +1 @@
+a/(b-c+d)*(e-a)*c
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/009-normal.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/009-normal.out
new file mode 100644
index 00000000..5d2ac2e2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/009-normal.out
@@ -0,0 +1 @@
+abc-d+/ea-*c*
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/010-normal.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/010-normal.in
new file mode 100644
index 00000000..703cd228
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/010-normal.in
@@ -0,0 +1 @@
+a+
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/010-normal.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/010-normal.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/010-normal.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/011-normal.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/011-normal.in
new file mode 100644
index 00000000..daea40b7
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/011-normal.in
@@ -0,0 +1 @@
++a
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/011-normal.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/011-normal.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/011-normal.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/012-normal.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/012-normal.in
new file mode 100644
index 00000000..baa17a6b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/012-normal.in
@@ -0,0 +1 @@
+a(b+c)
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/012-normal.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/012-normal.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/012-normal.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/013-normal.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/013-normal.in
new file mode 100644
index 00000000..21522a5f
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/013-normal.in
@@ -0,0 +1 @@
+a++b
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/013-normal.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/013-normal.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/013-normal.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/014-normal.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/014-normal.in
new file mode 100644
index 00000000..0bc905d6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/014-normal.in
@@ -0,0 +1 @@
+(a+b
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/014-normal.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/014-normal.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/014-normal.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/015-normal.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/015-normal.in
new file mode 100644
index 00000000..c60d2573
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/015-normal.in
@@ -0,0 +1 @@
+a+b)
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/015-normal.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/015-normal.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/015-normal.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/016-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/016-regression.in
new file mode 100644
index 00000000..6a452c18
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/016-regression.in
@@ -0,0 +1 @@
+()
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/016-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/016-regression.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/016-regression.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/017-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/017-regression.in
new file mode 100644
index 00000000..2ba1679b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/017-regression.in
@@ -0,0 +1 @@
+a+()
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/017-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/017-regression.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/017-regression.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/018-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/018-regression.in
new file mode 100644
index 00000000..997f180e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/018-regression.in
@@ -0,0 +1 @@
+a$b
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/018-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/018-regression.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/018-regression.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/019-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/019-regression.in
new file mode 100644
index 00000000..3a46b1b7
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/019-regression.in
@@ -0,0 +1 @@
+a*b/c
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/019-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/019-regression.out
new file mode 100644
index 00000000..d8f74feb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/019-regression.out
@@ -0,0 +1 @@
+ab*c/
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/020-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/020-regression.in
new file mode 100644
index 00000000..de880a86
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/020-regression.in
@@ -0,0 +1 @@
+a*(b/(c-d))
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/020-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/020-regression.out
new file mode 100644
index 00000000..a8d9b565
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/020-regression.out
@@ -0,0 +1 @@
+abcd-/*
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.in
new file mode 100644
index 00000000..fcc49a64
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.in
@@ -0,0 +1 @@
+1+2*3
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.out
new file mode 100644
index 00000000..1544f920
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.out
@@ -0,0 +1 @@
+123*+
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.in
new file mode 100644
index 00000000..cb2a4d43
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.in
@@ -0,0 +1 @@
+((a))
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.out
new file mode 100644
index 00000000..78981922
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.out
@@ -0,0 +1 @@
+a
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.in
new file mode 100644
index 00000000..80bac433
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.in
@@ -0,0 +1 @@
+a/(b-c)
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.out
new file mode 100644
index 00000000..0f615687
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.out
@@ -0,0 +1 @@
+abc-/
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.in
new file mode 100644
index 00000000..58e275e9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.in
@@ -0,0 +1 @@
+a+((b*c)-d)
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.out
new file mode 100644
index 00000000..41c06973
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.out
@@ -0,0 +1 @@
+abc*d-+
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.in
new file mode 100644
index 00000000..923c73c1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.in
@@ -0,0 +1 @@
+a+*b
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.out
new file mode 100644
index 00000000..5df7507e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.out
@@ -0,0 +1 @@
+ERROR
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/cases.json b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/Makefile b/labs/chapter-02/exercise/E-02-12-next-greater-element/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/README.md b/labs/chapter-02/exercise/E-02-12-next-greater-element/README.md
new file mode 100644
index 00000000..37aae664
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/README.md
@@ -0,0 +1,76 @@
+---
+title: "Lab 02-E-12：下一个更大元素"
+description: "维护单调递减候选栈，求右侧第一个严格更大值。"
+order: 23
+chapter: 2
+labId: "02E12"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-12：下一个更大元素
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+维护单调递减候选栈，求右侧第一个严格更大值。
+
+## 输入格式
+
+第一行 `n`；第二行 `n` 个整数。
+
+## 输出格式
+
+输出每个位置右侧第一个严格更大值；不存在输出 `-1`。各答案以单个空格分隔，末尾输出换行。
+
+## 数据范围与限制
+
+- `0 <= n <= 200000`；当 `n=0` 时第二行为空，输出空行。
+- 输入规模不超过 `200000`，除题面另有说明外整数使用 64 位有符号范围。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法应为线性或摊还线性时间，辅助空间不超过 `O(n)`。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-12-next-greater-element
+pnpm lab:run -- labs/chapter-02/exercise/E-02-12-next-greater-element
+pnpm lab:score -- labs/chapter-02/exercise/E-02-12-next-greater-element
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/lab.json b/labs/chapter-02/exercise/E-02-12-next-greater-element/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/solution/main.cpp b/labs/chapter-02/exercise/E-02-12-next-greater-element/solution/main.cpp
new file mode 100644
index 00000000..554020db
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/solution/main.cpp
@@ -0,0 +1,15 @@
+#include <cstddef>
+#include <iostream>
+#include <vector>
+
+int main() {
+    std::size_t n = 0; if (!(std::cin >> n)) return 0;
+    std::vector<long long> a(n), answer(n, -1); std::vector<std::size_t> pending;
+    for (auto& x : a) std::cin >> x;
+    for (std::size_t i = 0; i < n; ++i) {
+        while (!pending.empty() && a[pending.back()] < a[i]) { answer[pending.back()] = a[i]; pending.pop_back(); }
+        pending.push_back(i);
+    }
+    for (std::size_t i = 0; i < n; ++i) std::cout << (i ? " " : "") << answer[i];
+    std::cout << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/student/main.cpp b/labs/chapter-02/exercise/E-02-12-next-greater-element/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/001-sample.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/001-sample.in
new file mode 100644
index 00000000..6ed281c7
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/001-sample.in
@@ -0,0 +1,2 @@
+1
+1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/001-sample.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/001-sample.out
new file mode 100644
index 00000000..3a2e3f49
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/001-sample.out
@@ -0,0 +1 @@
+-1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/002-boundary.in
new file mode 100644
index 00000000..65cd4f58
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/002-boundary.in
@@ -0,0 +1,2 @@
+2
+2 1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/002-boundary.out
new file mode 100644
index 00000000..9b56b57b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/002-boundary.out
@@ -0,0 +1 @@
+-1 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/003-boundary.in
new file mode 100644
index 00000000..a789e877
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/003-boundary.in
@@ -0,0 +1,2 @@
+2
+1 2
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/003-boundary.out
new file mode 100644
index 00000000..97940c7d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/003-boundary.out
@@ -0,0 +1 @@
+2 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/004-boundary.in
new file mode 100644
index 00000000..2d777856
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/004-boundary.in
@@ -0,0 +1,2 @@
+2
+2 2
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/004-boundary.out
new file mode 100644
index 00000000..9b56b57b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/004-boundary.out
@@ -0,0 +1 @@
+-1 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/005-boundary.in
new file mode 100644
index 00000000..8b98c7f1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/005-boundary.in
@@ -0,0 +1,2 @@
+3
+2 1 2
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/005-boundary.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/005-boundary.out
new file mode 100644
index 00000000..9608cd14
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/005-boundary.out
@@ -0,0 +1 @@
+-1 2 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/006-normal.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/006-normal.in
new file mode 100644
index 00000000..cca7fe34
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/006-normal.in
@@ -0,0 +1,2 @@
+5
+5 1 4 2 6
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/006-normal.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/006-normal.out
new file mode 100644
index 00000000..51a6185d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/006-normal.out
@@ -0,0 +1 @@
+6 4 6 6 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/007-normal.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/007-normal.in
new file mode 100644
index 00000000..8db8ab6d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/007-normal.in
@@ -0,0 +1,2 @@
+6
+6 5 4 3 2 1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/007-normal.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/007-normal.out
new file mode 100644
index 00000000..bc5e4943
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/007-normal.out
@@ -0,0 +1 @@
+-1 -1 -1 -1 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/008-normal.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/008-normal.in
new file mode 100644
index 00000000..5ee886e1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/008-normal.in
@@ -0,0 +1,2 @@
+6
+1 2 3 4 5 6
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/008-normal.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/008-normal.out
new file mode 100644
index 00000000..157e6f88
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/008-normal.out
@@ -0,0 +1 @@
+2 3 4 5 6 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/009-normal.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/009-normal.in
new file mode 100644
index 00000000..5aab6eaa
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/009-normal.in
@@ -0,0 +1,2 @@
+4
+-1 -3 -2 -4
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/009-normal.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/009-normal.out
new file mode 100644
index 00000000..481daef0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/009-normal.out
@@ -0,0 +1 @@
+-1 -2 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/010-normal.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/010-normal.in
new file mode 100644
index 00000000..3f62807b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/010-normal.in
@@ -0,0 +1,2 @@
+4
+0 0 0 0
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/010-normal.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/010-normal.out
new file mode 100644
index 00000000..97610e3c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/010-normal.out
@@ -0,0 +1 @@
+-1 -1 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/011-normal.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/011-normal.in
new file mode 100644
index 00000000..481b7578
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/011-normal.in
@@ -0,0 +1,2 @@
+5
+7 1 7 1 7
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/011-normal.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/011-normal.out
new file mode 100644
index 00000000..f144f379
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/011-normal.out
@@ -0,0 +1 @@
+-1 7 -1 7 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/012-normal.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/012-normal.in
new file mode 100644
index 00000000..824a30e0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/012-normal.in
@@ -0,0 +1,2 @@
+6
+3 8 2 9 1 10
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/012-normal.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/012-normal.out
new file mode 100644
index 00000000..f4a43a8d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/012-normal.out
@@ -0,0 +1 @@
+8 9 9 10 10 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/013-normal.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/013-normal.in
new file mode 100644
index 00000000..ece8fbdb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/013-normal.in
@@ -0,0 +1,2 @@
+5
+10 9 8 7 6
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/013-normal.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/013-normal.out
new file mode 100644
index 00000000..5302f772
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/013-normal.out
@@ -0,0 +1 @@
+-1 -1 -1 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/014-normal.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/014-normal.in
new file mode 100644
index 00000000..8215b61b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/014-normal.in
@@ -0,0 +1,2 @@
+5
+4 1 2 3 0
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/014-normal.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/014-normal.out
new file mode 100644
index 00000000..411b70e1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/014-normal.out
@@ -0,0 +1 @@
+-1 2 3 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/015-normal.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/015-normal.in
new file mode 100644
index 00000000..73c8c8e6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/015-normal.in
@@ -0,0 +1,2 @@
+5
+100 -100 50 -50 0
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/015-normal.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/015-normal.out
new file mode 100644
index 00000000..59cfa639
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/015-normal.out
@@ -0,0 +1 @@
+-1 50 -1 0 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/016-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/016-regression.in
new file mode 100644
index 00000000..430eb31e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/016-regression.in
@@ -0,0 +1,2 @@
+7
+9 1 8 2 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/016-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/016-regression.out
new file mode 100644
index 00000000..d41d1593
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/016-regression.out
@@ -0,0 +1 @@
+-1 8 -1 7 -1 6 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/017-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/017-regression.in
new file mode 100644
index 00000000..49184691
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/017-regression.in
@@ -0,0 +1,2 @@
+6
+1 3 2 4 3 5
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/017-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/017-regression.out
new file mode 100644
index 00000000..1be57f3f
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/017-regression.out
@@ -0,0 +1 @@
+3 4 4 5 5 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/018-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/018-regression.in
new file mode 100644
index 00000000..efa0c2e6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/018-regression.in
@@ -0,0 +1,2 @@
+6
+5 5 4 4 3 3
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/018-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/018-regression.out
new file mode 100644
index 00000000..bc5e4943
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/018-regression.out
@@ -0,0 +1 @@
+-1 -1 -1 -1 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/019-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/019-regression.in
new file mode 100644
index 00000000..cfc22005
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/019-regression.in
@@ -0,0 +1,2 @@
+6
+2 9 1 8 0 7
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/019-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/019-regression.out
new file mode 100644
index 00000000..b273e37c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/019-regression.out
@@ -0,0 +1 @@
+9 -1 8 -1 7 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/020-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/020-regression.in
new file mode 100644
index 00000000..08c96f86
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/020-regression.in
@@ -0,0 +1,2 @@
+7
+11 4 12 3 13 2 14
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/020-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/020-regression.out
new file mode 100644
index 00000000..731f06c2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/020-regression.out
@@ -0,0 +1 @@
+12 12 13 13 14 14 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.in
new file mode 100644
index 00000000..4d4937eb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.in
@@ -0,0 +1,2 @@
+4
+1000000000 -1000000000 0 999999999
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.out
new file mode 100644
index 00000000..d4612c8f
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.out
@@ -0,0 +1 @@
+-1 0 999999999 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.in
new file mode 100644
index 00000000..35ef900d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.in
@@ -0,0 +1,2 @@
+6
+6 2 5 1 4 3
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.out
new file mode 100644
index 00000000..8139993e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.out
@@ -0,0 +1 @@
+-1 5 -1 4 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.in
new file mode 100644
index 00000000..bfb0c78d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.in
@@ -0,0 +1,2 @@
+7
+8 6 7 5 3 0 9
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.out
new file mode 100644
index 00000000..ded565ba
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.out
@@ -0,0 +1 @@
+9 7 9 9 9 9 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.in
new file mode 100644
index 00000000..5cc603ce
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.in
@@ -0,0 +1,2 @@
+8
+1 4 2 8 5 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.out
new file mode 100644
index 00000000..6fdafab8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.out
@@ -0,0 +1 @@
+4 8 8 -1 7 -1 6 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.in
new file mode 100644
index 00000000..8f46cfea
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.in
@@ -0,0 +1,2 @@
+7
+12 1 11 2 10 3 9
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.out
new file mode 100644
index 00000000..7c30f7a8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.out
@@ -0,0 +1 @@
+-1 11 -1 10 -1 9 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/cases.json b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/Makefile b/labs/chapter-02/exercise/E-02-13-next-smaller-element/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/README.md b/labs/chapter-02/exercise/E-02-13-next-smaller-element/README.md
new file mode 100644
index 00000000..3ec2cc6a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/README.md
@@ -0,0 +1,76 @@
+---
+title: "Lab 02-E-13：下一个更小元素"
+description: "维护单调递增候选栈，求右侧第一个严格更小值。"
+order: 24
+chapter: 2
+labId: "02E13"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-13：下一个更小元素
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+维护单调递增候选栈，求右侧第一个严格更小值。
+
+## 输入格式
+
+第一行 `n`；第二行 `n` 个整数。
+
+## 输出格式
+
+输出每个位置右侧第一个严格更小值；不存在输出 `-1`。各答案以单个空格分隔，末尾输出换行。
+
+## 数据范围与限制
+
+- `0 <= n <= 200000`；当 `n=0` 时第二行为空，输出空行。
+- 输入规模不超过 `200000`，除题面另有说明外整数使用 64 位有符号范围。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法应为线性或摊还线性时间，辅助空间不超过 `O(n)`。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-13-next-smaller-element
+pnpm lab:run -- labs/chapter-02/exercise/E-02-13-next-smaller-element
+pnpm lab:score -- labs/chapter-02/exercise/E-02-13-next-smaller-element
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/lab.json b/labs/chapter-02/exercise/E-02-13-next-smaller-element/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/solution/main.cpp b/labs/chapter-02/exercise/E-02-13-next-smaller-element/solution/main.cpp
new file mode 100644
index 00000000..baa995c8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/solution/main.cpp
@@ -0,0 +1,15 @@
+#include <cstddef>
+#include <iostream>
+#include <vector>
+
+int main() {
+    std::size_t n = 0; if (!(std::cin >> n)) return 0;
+    std::vector<long long> a(n), answer(n, -1); std::vector<std::size_t> pending;
+    for (auto& x : a) std::cin >> x;
+    for (std::size_t i = 0; i < n; ++i) {
+        while (!pending.empty() && a[pending.back()] > a[i]) { answer[pending.back()] = a[i]; pending.pop_back(); }
+        pending.push_back(i);
+    }
+    for (std::size_t i = 0; i < n; ++i) std::cout << (i ? " " : "") << answer[i];
+    std::cout << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/student/main.cpp b/labs/chapter-02/exercise/E-02-13-next-smaller-element/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/001-sample.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/001-sample.in
new file mode 100644
index 00000000..6ed281c7
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/001-sample.in
@@ -0,0 +1,2 @@
+1
+1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/001-sample.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/001-sample.out
new file mode 100644
index 00000000..3a2e3f49
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/001-sample.out
@@ -0,0 +1 @@
+-1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/002-boundary.in
new file mode 100644
index 00000000..65cd4f58
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/002-boundary.in
@@ -0,0 +1,2 @@
+2
+2 1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/002-boundary.out
new file mode 100644
index 00000000..7428044d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/002-boundary.out
@@ -0,0 +1 @@
+1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/003-boundary.in
new file mode 100644
index 00000000..a789e877
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/003-boundary.in
@@ -0,0 +1,2 @@
+2
+1 2
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/003-boundary.out
new file mode 100644
index 00000000..9b56b57b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/003-boundary.out
@@ -0,0 +1 @@
+-1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/004-boundary.in
new file mode 100644
index 00000000..2d777856
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/004-boundary.in
@@ -0,0 +1,2 @@
+2
+2 2
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/004-boundary.out
new file mode 100644
index 00000000..9b56b57b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/004-boundary.out
@@ -0,0 +1 @@
+-1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/005-boundary.in
new file mode 100644
index 00000000..8b98c7f1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/005-boundary.in
@@ -0,0 +1,2 @@
+3
+2 1 2
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/005-boundary.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/005-boundary.out
new file mode 100644
index 00000000..562aba03
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/005-boundary.out
@@ -0,0 +1 @@
+1 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/006-normal.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/006-normal.in
new file mode 100644
index 00000000..cca7fe34
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/006-normal.in
@@ -0,0 +1,2 @@
+5
+5 1 4 2 6
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/006-normal.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/006-normal.out
new file mode 100644
index 00000000..1b1dc1a1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/006-normal.out
@@ -0,0 +1 @@
+1 -1 2 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/007-normal.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/007-normal.in
new file mode 100644
index 00000000..8db8ab6d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/007-normal.in
@@ -0,0 +1,2 @@
+6
+6 5 4 3 2 1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/007-normal.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/007-normal.out
new file mode 100644
index 00000000..277d2513
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/007-normal.out
@@ -0,0 +1 @@
+5 4 3 2 1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/008-normal.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/008-normal.in
new file mode 100644
index 00000000..5ee886e1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/008-normal.in
@@ -0,0 +1,2 @@
+6
+1 2 3 4 5 6
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/008-normal.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/008-normal.out
new file mode 100644
index 00000000..bc5e4943
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/008-normal.out
@@ -0,0 +1 @@
+-1 -1 -1 -1 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/009-normal.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/009-normal.in
new file mode 100644
index 00000000..5aab6eaa
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/009-normal.in
@@ -0,0 +1,2 @@
+4
+-1 -3 -2 -4
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/009-normal.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/009-normal.out
new file mode 100644
index 00000000..faa0d1ff
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/009-normal.out
@@ -0,0 +1 @@
+-3 -4 -4 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/010-normal.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/010-normal.in
new file mode 100644
index 00000000..3f62807b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/010-normal.in
@@ -0,0 +1,2 @@
+4
+0 0 0 0
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/010-normal.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/010-normal.out
new file mode 100644
index 00000000..97610e3c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/010-normal.out
@@ -0,0 +1 @@
+-1 -1 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/011-normal.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/011-normal.in
new file mode 100644
index 00000000..481b7578
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/011-normal.in
@@ -0,0 +1,2 @@
+5
+7 1 7 1 7
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/011-normal.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/011-normal.out
new file mode 100644
index 00000000..31c7519c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/011-normal.out
@@ -0,0 +1 @@
+1 -1 1 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/012-normal.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/012-normal.in
new file mode 100644
index 00000000..824a30e0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/012-normal.in
@@ -0,0 +1,2 @@
+6
+3 8 2 9 1 10
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/012-normal.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/012-normal.out
new file mode 100644
index 00000000..02d4b561
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/012-normal.out
@@ -0,0 +1 @@
+2 2 1 1 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/013-normal.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/013-normal.in
new file mode 100644
index 00000000..ece8fbdb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/013-normal.in
@@ -0,0 +1,2 @@
+5
+10 9 8 7 6
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/013-normal.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/013-normal.out
new file mode 100644
index 00000000..465b62fa
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/013-normal.out
@@ -0,0 +1 @@
+9 8 7 6 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/014-normal.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/014-normal.in
new file mode 100644
index 00000000..8215b61b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/014-normal.in
@@ -0,0 +1,2 @@
+5
+4 1 2 3 0
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/014-normal.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/014-normal.out
new file mode 100644
index 00000000..249b0f7e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/014-normal.out
@@ -0,0 +1 @@
+1 0 0 0 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/015-normal.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/015-normal.in
new file mode 100644
index 00000000..73c8c8e6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/015-normal.in
@@ -0,0 +1,2 @@
+5
+100 -100 50 -50 0
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/015-normal.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/015-normal.out
new file mode 100644
index 00000000..063e6e34
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/015-normal.out
@@ -0,0 +1 @@
+-100 -1 -50 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/016-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/016-regression.in
new file mode 100644
index 00000000..430eb31e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/016-regression.in
@@ -0,0 +1,2 @@
+7
+9 1 8 2 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/016-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/016-regression.out
new file mode 100644
index 00000000..92aa1130
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/016-regression.out
@@ -0,0 +1 @@
+1 -1 2 -1 3 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/017-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/017-regression.in
new file mode 100644
index 00000000..49184691
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/017-regression.in
@@ -0,0 +1,2 @@
+6
+1 3 2 4 3 5
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/017-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/017-regression.out
new file mode 100644
index 00000000..1935767b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/017-regression.out
@@ -0,0 +1 @@
+-1 2 -1 3 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/018-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/018-regression.in
new file mode 100644
index 00000000..efa0c2e6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/018-regression.in
@@ -0,0 +1,2 @@
+6
+5 5 4 4 3 3
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/018-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/018-regression.out
new file mode 100644
index 00000000..3b71c4bb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/018-regression.out
@@ -0,0 +1 @@
+4 4 3 3 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/019-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/019-regression.in
new file mode 100644
index 00000000..cfc22005
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/019-regression.in
@@ -0,0 +1,2 @@
+6
+2 9 1 8 0 7
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/019-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/019-regression.out
new file mode 100644
index 00000000..d3928797
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/019-regression.out
@@ -0,0 +1 @@
+1 1 0 0 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/020-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/020-regression.in
new file mode 100644
index 00000000..08c96f86
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/020-regression.in
@@ -0,0 +1,2 @@
+7
+11 4 12 3 13 2 14
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/020-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/020-regression.out
new file mode 100644
index 00000000..99c976ff
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/020-regression.out
@@ -0,0 +1 @@
+4 3 3 2 2 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.in
new file mode 100644
index 00000000..4d4937eb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.in
@@ -0,0 +1,2 @@
+4
+1000000000 -1000000000 0 999999999
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.out
new file mode 100644
index 00000000..9424218e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.out
@@ -0,0 +1 @@
+-1000000000 -1 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.in
new file mode 100644
index 00000000..35ef900d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.in
@@ -0,0 +1,2 @@
+6
+6 2 5 1 4 3
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.out
new file mode 100644
index 00000000..31fb5b3d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.out
@@ -0,0 +1 @@
+2 1 1 -1 3 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.in
new file mode 100644
index 00000000..bfb0c78d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.in
@@ -0,0 +1,2 @@
+7
+8 6 7 5 3 0 9
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.out
new file mode 100644
index 00000000..f8667d74
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.out
@@ -0,0 +1 @@
+6 5 5 3 0 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.in
new file mode 100644
index 00000000..5cc603ce
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.in
@@ -0,0 +1,2 @@
+8
+1 4 2 8 5 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.out
new file mode 100644
index 00000000..9848ad1a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.out
@@ -0,0 +1 @@
+-1 2 -1 5 3 3 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.in
new file mode 100644
index 00000000..8f46cfea
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.in
@@ -0,0 +1,2 @@
+7
+12 1 11 2 10 3 9
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.out
new file mode 100644
index 00000000..92aa1130
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.out
@@ -0,0 +1 @@
+1 -1 2 -1 3 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/cases.json b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/Makefile b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/README.md b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/README.md
new file mode 100644
index 00000000..605b1c00
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/README.md
@@ -0,0 +1,76 @@
+---
+title: "Lab 02-E-14：农夫抓牛"
+description: "用 FIFO 队列按层扩散，求单位代价状态转移的最短步数。"
+order: 25
+chapter: 2
+labId: "02E14"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-14：农夫抓牛
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+用 FIFO 队列按层扩散，求单位代价状态转移的最短步数。
+
+## 输入格式
+
+一行 `start target limit`，位置均在 `[0, limit)` 内。
+
+## 输出格式
+
+输出从 start 到 target 的最少步数。
+
+## 数据范围与限制
+
+- 输入规模不超过 `200000`，除题面另有说明外整数使用 64 位有符号范围。
+- `1 <= limit <= 200000`，且 `0 <= start,target < limit`；三种移动分别为 `x-1`、`x+1`、`2*x`，越界移动忽略。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法应为线性或摊还线性时间，辅助空间不超过 `O(n)`。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-14-farmer-cow-bfs
+pnpm lab:run -- labs/chapter-02/exercise/E-02-14-farmer-cow-bfs
+pnpm lab:score -- labs/chapter-02/exercise/E-02-14-farmer-cow-bfs
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/lab.json b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/solution/main.cpp b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/solution/main.cpp
new file mode 100644
index 00000000..fcaa6050
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/solution/main.cpp
@@ -0,0 +1,17 @@
+#include <iostream>
+#include <queue>
+#include <vector>
+
+int main() {
+    int start = 0, target = 0, limit = 0;
+    if (!(std::cin >> start >> target >> limit)) return 0;
+    std::vector<int> distance(limit, -1); std::queue<int> queue;
+    distance[start] = 0; queue.push(start);
+    while (!queue.empty()) {
+        const int current = queue.front(); queue.pop();
+        if (current == target) break;
+        const int nexts[3] = {current - 1, current + 1, current * 2};
+        for (int next : nexts) if (next >= 0 && next < limit && distance[next] == -1) { distance[next] = distance[current] + 1; queue.push(next); }
+    }
+    std::cout << distance[target] << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/student/main.cpp b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/001-sample.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/001-sample.in
new file mode 100644
index 00000000..f5026a1e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/001-sample.in
@@ -0,0 +1 @@
+5 17 100
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/001-sample.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/001-sample.out
new file mode 100644
index 00000000..b8626c4c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/001-sample.out
@@ -0,0 +1 @@
+4
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/002-boundary.in
new file mode 100644
index 00000000..668d3d03
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/002-boundary.in
@@ -0,0 +1 @@
+0 0 10
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/002-boundary.out
new file mode 100644
index 00000000..573541ac
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/002-boundary.out
@@ -0,0 +1 @@
+0
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/003-boundary.in
new file mode 100644
index 00000000..cdfae9f7
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/003-boundary.in
@@ -0,0 +1 @@
+0 9 10
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/003-boundary.out
new file mode 100644
index 00000000..7ed6ff82
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/003-boundary.out
@@ -0,0 +1 @@
+5
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/004-boundary.in
new file mode 100644
index 00000000..7f00e93d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/004-boundary.in
@@ -0,0 +1 @@
+1 2 20
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/004-boundary.out
new file mode 100644
index 00000000..d00491fd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/004-boundary.out
@@ -0,0 +1 @@
+1
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/005-boundary.in
new file mode 100644
index 00000000..9154d26d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/005-boundary.in
@@ -0,0 +1 @@
+10 1 30
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/005-boundary.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/005-boundary.out
new file mode 100644
index 00000000..ec635144
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/005-boundary.out
@@ -0,0 +1 @@
+9
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/006-normal.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/006-normal.in
new file mode 100644
index 00000000..02296aba
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/006-normal.in
@@ -0,0 +1 @@
+7 14 30
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/006-normal.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/006-normal.out
new file mode 100644
index 00000000..d00491fd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/006-normal.out
@@ -0,0 +1 @@
+1
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/007-normal.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/007-normal.in
new file mode 100644
index 00000000..e41a1f4b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/007-normal.in
@@ -0,0 +1 @@
+3 10 20
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/007-normal.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/007-normal.out
new file mode 100644
index 00000000..00750edc
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/007-normal.out
@@ -0,0 +1 @@
+3
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/008-normal.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/008-normal.in
new file mode 100644
index 00000000..a2f11cb5
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/008-normal.in
@@ -0,0 +1 @@
+4 6 15
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/008-normal.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/008-normal.out
new file mode 100644
index 00000000..0cfbf088
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/008-normal.out
@@ -0,0 +1 @@
+2
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/009-normal.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/009-normal.in
new file mode 100644
index 00000000..dd680051
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/009-normal.in
@@ -0,0 +1 @@
+9 3 20
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/009-normal.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/009-normal.out
new file mode 100644
index 00000000..1e8b3149
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/009-normal.out
@@ -0,0 +1 @@
+6
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/010-normal.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/010-normal.in
new file mode 100644
index 00000000..2765e7a1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/010-normal.in
@@ -0,0 +1 @@
+0 31 64
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/010-normal.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/010-normal.out
new file mode 100644
index 00000000..7f8f011e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/010-normal.out
@@ -0,0 +1 @@
+7
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/011-normal.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/011-normal.in
new file mode 100644
index 00000000..36f1f1c3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/011-normal.in
@@ -0,0 +1 @@
+15 0 32
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/011-normal.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/011-normal.out
new file mode 100644
index 00000000..60d3b2f4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/011-normal.out
@@ -0,0 +1 @@
+15
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/012-normal.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/012-normal.in
new file mode 100644
index 00000000..77ecb67e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/012-normal.in
@@ -0,0 +1 @@
+2 19 40
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/012-normal.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/012-normal.out
new file mode 100644
index 00000000..7ed6ff82
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/012-normal.out
@@ -0,0 +1 @@
+5
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/013-normal.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/013-normal.in
new file mode 100644
index 00000000..ce282ab9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/013-normal.in
@@ -0,0 +1 @@
+20 5 50
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/013-normal.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/013-normal.out
new file mode 100644
index 00000000..60d3b2f4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/013-normal.out
@@ -0,0 +1 @@
+15
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/014-normal.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/014-normal.in
new file mode 100644
index 00000000..b4a07df0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/014-normal.in
@@ -0,0 +1 @@
+1 31 40
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/014-normal.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/014-normal.out
new file mode 100644
index 00000000..1e8b3149
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/014-normal.out
@@ -0,0 +1 @@
+6
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/015-normal.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/015-normal.in
new file mode 100644
index 00000000..610cbcef
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/015-normal.in
@@ -0,0 +1 @@
+8 23 40
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/015-normal.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/015-normal.out
new file mode 100644
index 00000000..7ed6ff82
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/015-normal.out
@@ -0,0 +1 @@
+5
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/016-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/016-regression.in
new file mode 100644
index 00000000..f1d2ee2f
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/016-regression.in
@@ -0,0 +1 @@
+6 18 30
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/016-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/016-regression.out
new file mode 100644
index 00000000..b8626c4c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/016-regression.out
@@ -0,0 +1 @@
+4
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/017-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/017-regression.in
new file mode 100644
index 00000000..db9f6eee
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/017-regression.in
@@ -0,0 +1 @@
+12 25 40
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/017-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/017-regression.out
new file mode 100644
index 00000000..0cfbf088
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/017-regression.out
@@ -0,0 +1 @@
+2
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/018-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/018-regression.in
new file mode 100644
index 00000000..e6206b9a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/018-regression.in
@@ -0,0 +1 @@
+30 1 64
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/018-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/018-regression.out
new file mode 100644
index 00000000..f04c001f
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/018-regression.out
@@ -0,0 +1 @@
+29
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/019-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/019-regression.in
new file mode 100644
index 00000000..4cf2197e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/019-regression.in
@@ -0,0 +1 @@
+3 3 8
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/019-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/019-regression.out
new file mode 100644
index 00000000..573541ac
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/019-regression.out
@@ -0,0 +1 @@
+0
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/020-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/020-regression.in
new file mode 100644
index 00000000..07cc76e2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/020-regression.in
@@ -0,0 +1 @@
+11 27 50
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/020-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/020-regression.out
new file mode 100644
index 00000000..b8626c4c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/020-regression.out
@@ -0,0 +1 @@
+4
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.in
new file mode 100644
index 00000000..de80d2c2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.in
@@ -0,0 +1 @@
+0 15 32
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.out
new file mode 100644
index 00000000..1e8b3149
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.out
@@ -0,0 +1 @@
+6
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.in
new file mode 100644
index 00000000..85521d37
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.in
@@ -0,0 +1 @@
+16 2 40
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.out
new file mode 100644
index 00000000..8351c193
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.out
@@ -0,0 +1 @@
+14
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.in
new file mode 100644
index 00000000..7d410f46
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.in
@@ -0,0 +1 @@
+5 29 60
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.out
new file mode 100644
index 00000000..7ed6ff82
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.out
@@ -0,0 +1 @@
+5
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.in
new file mode 100644
index 00000000..65b316d0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.in
@@ -0,0 +1 @@
+14 31 64
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.out
new file mode 100644
index 00000000..00750edc
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.out
@@ -0,0 +1 @@
+3
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.in
new file mode 100644
index 00000000..953645ce
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.in
@@ -0,0 +1 @@
+21 42 80
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.out
new file mode 100644
index 00000000..d00491fd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.out
@@ -0,0 +1 @@
+1
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/cases.json b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/Makefile b/labs/chapter-02/exercise/E-02-15-josephus-order/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/README.md b/labs/chapter-02/exercise/E-02-15-josephus-order/README.md
new file mode 100644
index 00000000..35706eee
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/README.md
@@ -0,0 +1,77 @@
+---
+title: "Lab 02-E-15：Josephus 出列顺序"
+description: "用循环队列模拟报数与出列。"
+order: 26
+chapter: 2
+labId: "02E15"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-15：Josephus 出列顺序
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+用循环队列模拟报数与出列。
+
+## 输入格式
+
+一行正整数 `n k`。
+
+## 输出格式
+
+输出从 1 到 n 的完整出列顺序，各编号以单个空格分隔，末尾输出换行。
+
+## 数据范围与限制
+
+- 除题面另有说明外整数使用 64 位有符号范围。
+- `1 <= n <= 5000` 且 `1 <= k <= 5000`；报数从当前队头开始，数到 `k` 的元素出列，下一轮从其后一个元素继续。
+- 本题的循环队列模拟允许 `O(nk)` 最坏时间，辅助空间为 `O(n)`。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法应符合本题给出的 `O(nk)` 循环队列模拟要求。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-15-josephus-order
+pnpm lab:run -- labs/chapter-02/exercise/E-02-15-josephus-order
+pnpm lab:score -- labs/chapter-02/exercise/E-02-15-josephus-order
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/lab.json b/labs/chapter-02/exercise/E-02-15-josephus-order/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/solution/main.cpp b/labs/chapter-02/exercise/E-02-15-josephus-order/solution/main.cpp
new file mode 100644
index 00000000..c7a53109
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/solution/main.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+#include <queue>
+
+int main() {
+    int n = 0, step = 0; if (!(std::cin >> n >> step)) return 0;
+    std::queue<int> circle; for (int i = 1; i <= n; ++i) circle.push(i);
+    bool first = true;
+    while (!circle.empty()) {
+        for (int i = 1; i < step; ++i) { circle.push(circle.front()); circle.pop(); }
+        if (!first) std::cout << ' '; first = false;
+        std::cout << circle.front(); circle.pop();
+    }
+    std::cout << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/student/main.cpp b/labs/chapter-02/exercise/E-02-15-josephus-order/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/001-sample.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/001-sample.in
new file mode 100644
index 00000000..7f036e7b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/001-sample.in
@@ -0,0 +1 @@
+7 3
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/001-sample.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/001-sample.out
new file mode 100644
index 00000000..01b53993
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/001-sample.out
@@ -0,0 +1 @@
+3 6 2 7 5 1 4
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/002-boundary.in
new file mode 100644
index 00000000..2fb73a07
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/002-boundary.in
@@ -0,0 +1 @@
+1 1
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/002-boundary.out
new file mode 100644
index 00000000..d00491fd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/002-boundary.out
@@ -0,0 +1 @@
+1
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/003-boundary.in
new file mode 100644
index 00000000..2c3e36b5
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/003-boundary.in
@@ -0,0 +1 @@
+5 1
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/003-boundary.out
new file mode 100644
index 00000000..aacb5952
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/003-boundary.out
@@ -0,0 +1 @@
+1 2 3 4 5
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/004-boundary.in
new file mode 100644
index 00000000..69010fb2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/004-boundary.in
@@ -0,0 +1 @@
+5 2
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/004-boundary.out
new file mode 100644
index 00000000..5e4d8855
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/004-boundary.out
@@ -0,0 +1 @@
+2 4 1 5 3
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/005-boundary.in
new file mode 100644
index 00000000..299a71f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/005-boundary.in
@@ -0,0 +1 @@
+5 5
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/005-boundary.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/005-boundary.out
new file mode 100644
index 00000000..31d9d701
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/005-boundary.out
@@ -0,0 +1 @@
+5 1 3 4 2
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/006-normal.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/006-normal.in
new file mode 100644
index 00000000..395f206d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/006-normal.in
@@ -0,0 +1 @@
+10 3
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/006-normal.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/006-normal.out
new file mode 100644
index 00000000..ce53a8df
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/006-normal.out
@@ -0,0 +1 @@
+3 6 9 2 7 1 8 5 10 4
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/007-normal.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/007-normal.in
new file mode 100644
index 00000000..9efb403a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/007-normal.in
@@ -0,0 +1 @@
+6 4
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/007-normal.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/007-normal.out
new file mode 100644
index 00000000..c1d5f1fb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/007-normal.out
@@ -0,0 +1 @@
+4 2 1 3 6 5
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/008-normal.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/008-normal.in
new file mode 100644
index 00000000..b931b626
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/008-normal.in
@@ -0,0 +1 @@
+8 7
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/008-normal.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/008-normal.out
new file mode 100644
index 00000000..c77f02f8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/008-normal.out
@@ -0,0 +1 @@
+7 6 8 2 5 1 3 4
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/009-normal.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/009-normal.in
new file mode 100644
index 00000000..63eba865
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/009-normal.in
@@ -0,0 +1 @@
+9 2
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/009-normal.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/009-normal.out
new file mode 100644
index 00000000..b7cd0365
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/009-normal.out
@@ -0,0 +1 @@
+2 4 6 8 1 5 9 7 3
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/010-normal.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/010-normal.in
new file mode 100644
index 00000000..4e3994f8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/010-normal.in
@@ -0,0 +1 @@
+12 5
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/010-normal.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/010-normal.out
new file mode 100644
index 00000000..e4869624
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/010-normal.out
@@ -0,0 +1 @@
+5 10 3 9 4 12 8 7 11 2 6 1
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/011-normal.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/011-normal.in
new file mode 100644
index 00000000..5d737c73
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/011-normal.in
@@ -0,0 +1 @@
+3 10
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/011-normal.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/011-normal.out
new file mode 100644
index 00000000..d849ff9f
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/011-normal.out
@@ -0,0 +1 @@
+1 3 2
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/012-normal.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/012-normal.in
new file mode 100644
index 00000000..a222f032
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/012-normal.in
@@ -0,0 +1 @@
+15 1
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/012-normal.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/012-normal.out
new file mode 100644
index 00000000..3311a153
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/012-normal.out
@@ -0,0 +1 @@
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/013-normal.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/013-normal.in
new file mode 100644
index 00000000..58683797
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/013-normal.in
@@ -0,0 +1 @@
+11 6
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/013-normal.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/013-normal.out
new file mode 100644
index 00000000..72b51bcb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/013-normal.out
@@ -0,0 +1 @@
+6 1 8 4 2 11 3 7 5 10 9
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/014-normal.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/014-normal.in
new file mode 100644
index 00000000..13786522
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/014-normal.in
@@ -0,0 +1 @@
+20 3
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/014-normal.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/014-normal.out
new file mode 100644
index 00000000..384f2734
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/014-normal.out
@@ -0,0 +1 @@
+3 6 9 12 15 18 1 5 10 14 19 4 11 17 7 16 8 2 13 20
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/015-normal.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/015-normal.in
new file mode 100644
index 00000000..aaf55727
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/015-normal.in
@@ -0,0 +1 @@
+4 9
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/015-normal.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/015-normal.out
new file mode 100644
index 00000000..8aa271ad
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/015-normal.out
@@ -0,0 +1 @@
+1 4 2 3
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/016-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/016-regression.in
new file mode 100644
index 00000000..3de4f6dd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/016-regression.in
@@ -0,0 +1 @@
+13 4
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/016-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/016-regression.out
new file mode 100644
index 00000000..deb42a8b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/016-regression.out
@@ -0,0 +1 @@
+4 8 12 3 9 1 7 2 11 10 13 6 5
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/017-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/017-regression.in
new file mode 100644
index 00000000..d4ef52b9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/017-regression.in
@@ -0,0 +1 @@
+16 8
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/017-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/017-regression.out
new file mode 100644
index 00000000..18fe5ea2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/017-regression.out
@@ -0,0 +1 @@
+8 16 9 2 12 6 3 15 14 1 5 11 10 4 13 7
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/018-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/018-regression.in
new file mode 100644
index 00000000..11a0a477
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/018-regression.in
@@ -0,0 +1 @@
+2 100
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/018-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/018-regression.out
new file mode 100644
index 00000000..cba3471e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/018-regression.out
@@ -0,0 +1 @@
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diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/019-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/019-regression.in
new file mode 100644
index 00000000..f7f77f4d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/019-regression.in
@@ -0,0 +1 @@
+18 7
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/019-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/019-regression.out
new file mode 100644
index 00000000..c5c5ed8a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/019-regression.out
@@ -0,0 +1 @@
+7 14 3 11 1 10 2 13 6 18 16 15 17 5 12 4 8 9
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/020-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/020-regression.in
new file mode 100644
index 00000000..13ceeccd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/020-regression.in
@@ -0,0 +1 @@
+25 2
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/020-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/020-regression.out
new file mode 100644
index 00000000..3895dbd4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/020-regression.out
@@ -0,0 +1 @@
+2 4 6 8 10 12 14 16 18 20 22 24 1 5 9 13 17 21 25 7 15 23 11 3 19
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.in
new file mode 100644
index 00000000..ce3f1d21
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.in
@@ -0,0 +1 @@
+30 11
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.out
new file mode 100644
index 00000000..883671d6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.out
@@ -0,0 +1 @@
+11 22 3 15 27 9 23 6 20 5 21 8 26 14 2 25 17 12 7 4 10 16 24 1 29 30 19 13 18 28
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.in
new file mode 100644
index 00000000..f4590918
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.in
@@ -0,0 +1 @@
+7 20
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.out
new file mode 100644
index 00000000..c202a00c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.out
@@ -0,0 +1 @@
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diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.in
new file mode 100644
index 00000000..741103d9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.in
@@ -0,0 +1 @@
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diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.out
new file mode 100644
index 00000000..827a6ef2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.out
@@ -0,0 +1 @@
+14 1 3 6 10 4 12 11 2 9 5 8 7 13
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.in
new file mode 100644
index 00000000..68c9b89d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.in
@@ -0,0 +1 @@
+19 5
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.out
new file mode 100644
index 00000000..ff6cc6a8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.out
@@ -0,0 +1 @@
+5 10 15 1 7 13 19 8 16 4 14 6 18 12 11 17 3 9 2
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.in
new file mode 100644
index 00000000..08d7add5
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.in
@@ -0,0 +1 @@
+40 9
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.out
new file mode 100644
index 00000000..819fa82e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.out
@@ -0,0 +1 @@
+9 18 27 36 5 15 25 35 6 17 29 40 12 24 38 11 26 1 16 32 8 28 4 23 7 31 14 39 30 20 13 10 19 22 37 33 34 21 2 3
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/cases.json b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/Makefile b/labs/chapter-02/exercise/E-02-16-binary-number-queue/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/README.md b/labs/chapter-02/exercise/E-02-16-binary-number-queue/README.md
new file mode 100644
index 00000000..657f256a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/README.md
@@ -0,0 +1,76 @@
+---
+title: "Lab 02-E-16：队列生成二进制数"
+description: "用 FIFO 队列按数值顺序生成二进制表示。"
+order: 27
+chapter: 2
+labId: "02E16"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-16：队列生成二进制数
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+用 FIFO 队列按数值顺序生成二进制表示。
+
+## 输入格式
+
+一行正整数 `n`。
+
+## 输出格式
+
+输出从 1 到 n 的二进制表示，各表示以单个空格分隔，末尾输出换行。
+
+## 数据范围与限制
+
+- 输入规模不超过 `200000`，除题面另有说明外整数使用 64 位有符号范围。
+- `1 <= n <= 200000`；输出总字符数为 `O(n log n)`，算法时间和输出规模同阶，辅助队列空间为 `O(n log n)`。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法时间和输出规模同阶（`O(n log n)`），辅助队列空间为 `O(n log n)`。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-16-binary-number-queue
+pnpm lab:run -- labs/chapter-02/exercise/E-02-16-binary-number-queue
+pnpm lab:score -- labs/chapter-02/exercise/E-02-16-binary-number-queue
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/lab.json b/labs/chapter-02/exercise/E-02-16-binary-number-queue/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/solution/main.cpp b/labs/chapter-02/exercise/E-02-16-binary-number-queue/solution/main.cpp
new file mode 100644
index 00000000..fbcf0d6e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/solution/main.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+#include <queue>
+#include <string>
+
+int main() {
+    int n = 0; if (!(std::cin >> n)) return 0;
+    std::queue<std::string> queue; queue.push("1");
+    for (int i = 0; i < n; ++i) {
+        const std::string current = queue.front(); queue.pop();
+        if (i) std::cout << ' '; std::cout << current;
+        queue.push(current + "0"); queue.push(current + "1");
+    }
+    std::cout << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/student/main.cpp b/labs/chapter-02/exercise/E-02-16-binary-number-queue/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/001-sample.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/001-sample.in
new file mode 100644
index 00000000..d00491fd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/001-sample.in
@@ -0,0 +1 @@
+1
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/001-sample.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/001-sample.out
new file mode 100644
index 00000000..d00491fd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/001-sample.out
@@ -0,0 +1 @@
+1
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/002-boundary.in
new file mode 100644
index 00000000..0cfbf088
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/002-boundary.in
@@ -0,0 +1 @@
+2
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/002-boundary.out
new file mode 100644
index 00000000..aba06649
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/002-boundary.out
@@ -0,0 +1 @@
+1 10
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/003-boundary.in
new file mode 100644
index 00000000..00750edc
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/003-boundary.in
@@ -0,0 +1 @@
+3
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/003-boundary.out
new file mode 100644
index 00000000..0b4beccb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/003-boundary.out
@@ -0,0 +1 @@
+1 10 11
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/004-boundary.in
new file mode 100644
index 00000000..b8626c4c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/004-boundary.in
@@ -0,0 +1 @@
+4
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/004-boundary.out
new file mode 100644
index 00000000..f6de113a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/004-boundary.out
@@ -0,0 +1 @@
+1 10 11 100
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/005-boundary.in
new file mode 100644
index 00000000..7ed6ff82
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/005-boundary.in
@@ -0,0 +1 @@
+5
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/005-boundary.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/005-boundary.out
new file mode 100644
index 00000000..70e5d45e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/005-boundary.out
@@ -0,0 +1 @@
+1 10 11 100 101
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/006-normal.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/006-normal.in
new file mode 100644
index 00000000..1e8b3149
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/006-normal.in
@@ -0,0 +1 @@
+6
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/006-normal.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/006-normal.out
new file mode 100644
index 00000000..a6600554
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/006-normal.out
@@ -0,0 +1 @@
+1 10 11 100 101 110
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/007-normal.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/007-normal.in
new file mode 100644
index 00000000..7f8f011e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/007-normal.in
@@ -0,0 +1 @@
+7
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/007-normal.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/007-normal.out
new file mode 100644
index 00000000..8bd3bd66
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/007-normal.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/008-normal.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/008-normal.in
new file mode 100644
index 00000000..45a4fb75
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/008-normal.in
@@ -0,0 +1 @@
+8
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/008-normal.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/008-normal.out
new file mode 100644
index 00000000..47e268c0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/008-normal.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/009-normal.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/009-normal.in
new file mode 100644
index 00000000..ec635144
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/009-normal.in
@@ -0,0 +1 @@
+9
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/009-normal.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/009-normal.out
new file mode 100644
index 00000000..aefcb79f
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/009-normal.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/010-normal.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/010-normal.in
new file mode 100644
index 00000000..f599e28b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/010-normal.in
@@ -0,0 +1 @@
+10
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/010-normal.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/010-normal.out
new file mode 100644
index 00000000..0d6d0fd2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/010-normal.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/011-normal.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/011-normal.in
new file mode 100644
index 00000000..48082f72
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/011-normal.in
@@ -0,0 +1 @@
+12
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/011-normal.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/011-normal.out
new file mode 100644
index 00000000..188216f8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/011-normal.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/012-normal.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/012-normal.in
new file mode 100644
index 00000000..60d3b2f4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/012-normal.in
@@ -0,0 +1 @@
+15
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/012-normal.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/012-normal.out
new file mode 100644
index 00000000..c4eab1be
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/012-normal.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/013-normal.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/013-normal.in
new file mode 100644
index 00000000..b6a7d89c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/013-normal.in
@@ -0,0 +1 @@
+16
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/013-normal.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/013-normal.out
new file mode 100644
index 00000000..cd12ac5c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/013-normal.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/014-normal.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/014-normal.in
new file mode 100644
index 00000000..209e3ef4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/014-normal.in
@@ -0,0 +1 @@
+20
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/014-normal.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/014-normal.out
new file mode 100644
index 00000000..e5b6d8c9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/014-normal.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/015-normal.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/015-normal.in
new file mode 100644
index 00000000..7273c0fa
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/015-normal.in
@@ -0,0 +1 @@
+25
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/015-normal.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/015-normal.out
new file mode 100644
index 00000000..112e3681
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/015-normal.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/016-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/016-regression.in
new file mode 100644
index 00000000..e85087af
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/016-regression.in
@@ -0,0 +1 @@
+31
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/016-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/016-regression.out
new file mode 100644
index 00000000..9f020a99
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/016-regression.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/017-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/017-regression.in
new file mode 100644
index 00000000..f5c89552
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/017-regression.in
@@ -0,0 +1 @@
+32
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/017-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/017-regression.out
new file mode 100644
index 00000000..e169c0b5
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/017-regression.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/018-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/018-regression.in
new file mode 100644
index 00000000..425151f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/018-regression.in
@@ -0,0 +1 @@
+40
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/018-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/018-regression.out
new file mode 100644
index 00000000..a15416c5
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/018-regression.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/019-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/019-regression.in
new file mode 100644
index 00000000..e373ee69
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/019-regression.in
@@ -0,0 +1 @@
+50
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/019-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/019-regression.out
new file mode 100644
index 00000000..a0c4b582
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/019-regression.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/020-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/020-regression.in
new file mode 100644
index 00000000..4b9026d8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/020-regression.in
@@ -0,0 +1 @@
+63
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/020-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/020-regression.out
new file mode 100644
index 00000000..e1f76619
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/020-regression.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.in
new file mode 100644
index 00000000..900731ff
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.in
@@ -0,0 +1 @@
+64
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.out
new file mode 100644
index 00000000..a37e92a9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 1000000
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.in
new file mode 100644
index 00000000..78eb67ce
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.in
@@ -0,0 +1 @@
+75
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.out
new file mode 100644
index 00000000..c09ef981
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 1000000 1000001 1000010 1000011 1000100 1000101 1000110 1000111 1001000 1001001 1001010 1001011
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.in
new file mode 100644
index 00000000..3ad5abd0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.in
@@ -0,0 +1 @@
+99
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.out
new file mode 100644
index 00000000..cd8f74bb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 1000000 1000001 1000010 1000011 1000100 1000101 1000110 1000111 1001000 1001001 1001010 1001011 1001100 1001101 1001110 1001111 1010000 1010001 1010010 1010011 1010100 1010101 1010110 1010111 1011000 1011001 1011010 1011011 1011100 1011101 1011110 1011111 1100000 1100001 1100010 1100011
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.in
new file mode 100644
index 00000000..c75acbe2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.in
@@ -0,0 +1 @@
+127
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.out
new file mode 100644
index 00000000..1c15cf81
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 1000000 1000001 1000010 1000011 1000100 1000101 1000110 1000111 1001000 1001001 1001010 1001011 1001100 1001101 1001110 1001111 1010000 1010001 1010010 1010011 1010100 1010101 1010110 1010111 1011000 1011001 1011010 1011011 1011100 1011101 1011110 1011111 1100000 1100001 1100010 1100011 1100100 1100101 1100110 1100111 1101000 1101001 1101010 1101011 1101100 1101101 1101110 1101111 1110000 1110001 1110010 1110011 1110100 1110101 1110110 1110111 1111000 1111001 1111010 1111011 1111100 1111101 1111110 1111111
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.in
new file mode 100644
index 00000000..08839f6b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.in
@@ -0,0 +1 @@
+200
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.out
new file mode 100644
index 00000000..f1ee4012
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.out
@@ -0,0 +1 @@
+1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 1000000 1000001 1000010 1000011 1000100 1000101 1000110 1000111 1001000 1001001 1001010 1001011 1001100 1001101 1001110 1001111 1010000 1010001 1010010 1010011 1010100 1010101 1010110 1010111 1011000 1011001 1011010 1011011 1011100 1011101 1011110 1011111 1100000 1100001 1100010 1100011 1100100 1100101 1100110 1100111 1101000 1101001 1101010 1101011 1101100 1101101 1101110 1101111 1110000 1110001 1110010 1110011 1110100 1110101 1110110 1110111 1111000 1111001 1111010 1111011 1111100 1111101 1111110 1111111 10000000 10000001 10000010 10000011 10000100 10000101 10000110 10000111 10001000 10001001 10001010 10001011 10001100 10001101 10001110 10001111 10010000 10010001 10010010 10010011 10010100 10010101 10010110 10010111 10011000 10011001 10011010 10011011 10011100 10011101 10011110 10011111 10100000 10100001 10100010 10100011 10100100 10100101 10100110 10100111 10101000 10101001 10101010 10101011 10101100 10101101 10101110 10101111 10110000 10110001 10110010 10110011 10110100 10110101 10110110 10110111 10111000 10111001 10111010 10111011 10111100 10111101 10111110 10111111 11000000 11000001 11000010 11000011 11000100 11000101 11000110 11000111 11001000
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/cases.json b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/Makefile b/labs/chapter-02/exercise/E-02-17-palindrome-deque/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/README.md b/labs/chapter-02/exercise/E-02-17-palindrome-deque/README.md
new file mode 100644
index 00000000..bb0b7787
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/README.md
@@ -0,0 +1,75 @@
+---
+title: "Lab 02-E-17：双端队列回文检查"
+description: "从两端收缩比较字符，判断字符串是否回文。"
+order: 28
+chapter: 2
+labId: "02E17"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-17：双端队列回文检查
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+从两端收缩比较字符，判断字符串是否回文。
+
+## 输入格式
+
+一行仅含小写字母和数字的非空字符串。
+
+## 输出格式
+
+回文输出 `YES`，否则输出 `NO`。
+
+## 数据范围与限制
+
+- 输入规模不超过 `200000`，除题面另有说明外整数使用 64 位有符号范围。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法应为线性或摊还线性时间，辅助空间不超过 `O(n)`。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-17-palindrome-deque
+pnpm lab:run -- labs/chapter-02/exercise/E-02-17-palindrome-deque
+pnpm lab:score -- labs/chapter-02/exercise/E-02-17-palindrome-deque
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/lab.json b/labs/chapter-02/exercise/E-02-17-palindrome-deque/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/solution/main.cpp b/labs/chapter-02/exercise/E-02-17-palindrome-deque/solution/main.cpp
new file mode 100644
index 00000000..9ad05796
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/solution/main.cpp
@@ -0,0 +1,10 @@
+#include <iostream>
+#include <string>
+
+int main() {
+    std::string text; if (!(std::cin >> text)) return 0;
+    std::size_t left = 0, right = text.size();
+    bool same = true;
+    while (left < right) { --right; if (text[left++] != text[right]) { same = false; break; } }
+    std::cout << (same ? "YES" : "NO") << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/student/main.cpp b/labs/chapter-02/exercise/E-02-17-palindrome-deque/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/001-sample.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/001-sample.in
new file mode 100644
index 00000000..78981922
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/001-sample.in
@@ -0,0 +1 @@
+a
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/001-sample.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/001-sample.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/001-sample.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/002-boundary.in
new file mode 100644
index 00000000..e61ef7b9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/002-boundary.in
@@ -0,0 +1 @@
+aa
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/002-boundary.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/002-boundary.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/003-boundary.in
new file mode 100644
index 00000000..81bf3969
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/003-boundary.in
@@ -0,0 +1 @@
+ab
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/003-boundary.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/003-boundary.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/004-boundary.in
new file mode 100644
index 00000000..d9265f82
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/004-boundary.in
@@ -0,0 +1 @@
+aba
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/004-boundary.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/004-boundary.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/005-boundary.in
new file mode 100644
index 00000000..3656652b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/005-boundary.in
@@ -0,0 +1 @@
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new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/005-boundary.out
@@ -0,0 +1 @@
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new file mode 100644
index 00000000..2dc757fb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/006-normal.in
@@ -0,0 +1 @@
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new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/006-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/007-normal.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/007-normal.in
new file mode 100644
index 00000000..011bc89a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/007-normal.in
@@ -0,0 +1 @@
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diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/007-normal.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/007-normal.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/007-normal.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/008-normal.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/008-normal.in
new file mode 100644
index 00000000..be91f092
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/008-normal.in
@@ -0,0 +1 @@
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diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/008-normal.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/008-normal.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/008-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/009-normal.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/009-normal.in
new file mode 100644
index 00000000..66f481a0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/009-normal.in
@@ -0,0 +1 @@
+123421
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/009-normal.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/009-normal.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/009-normal.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/010-normal.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/010-normal.in
new file mode 100644
index 00000000..c8d20d38
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/010-normal.in
@@ -0,0 +1 @@
+racecar
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/010-normal.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/010-normal.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/010-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/011-normal.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/011-normal.in
new file mode 100644
index 00000000..af0f6302
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/011-normal.in
@@ -0,0 +1 @@
+level
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/011-normal.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/011-normal.out
new file mode 100644
index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/011-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/012-normal.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/012-normal.in
new file mode 100644
index 00000000..b69c7363
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/012-normal.in
@@ -0,0 +1 @@
+stack
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/012-normal.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/012-normal.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/012-normal.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/013-normal.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/013-normal.in
new file mode 100644
index 00000000..1fff7bce
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/013-normal.in
@@ -0,0 +1 @@
+queue
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/013-normal.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/013-normal.out
new file mode 100644
index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/013-normal.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/014-normal.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/014-normal.in
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index 00000000..90b45162
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/014-normal.in
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index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/014-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/015-normal.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/015-normal.in
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index 00000000..e3045825
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/015-normal.in
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index 00000000..f033a501
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+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/015-normal.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/016-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/016-regression.in
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index 00000000..753ff4fa
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/016-regression.in
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+ababab
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/016-regression.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/016-regression.out
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index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/016-regression.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/017-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/017-regression.in
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index 00000000..573541ac
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/017-regression.in
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+0
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/017-regression.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/017-regression.out
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index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/017-regression.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/018-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/018-regression.in
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index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/018-regression.out
@@ -0,0 +1 @@
+YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/019-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/019-regression.in
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index 00000000..2450c585
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/019-regression.in
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index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/019-regression.out
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diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/020-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/020-regression.in
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index 00000000..f033a501
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+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/020-regression.out
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diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/021-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/021-regression.in
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index 00000000..f033a501
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+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/021-regression.out
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diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/022-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/022-regression.in
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index 00000000..f033a501
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diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/023-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/023-regression.in
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diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/023-regression.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/023-regression.out
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diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/024-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/024-regression.in
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diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/024-regression.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/024-regression.out
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index 00000000..5e35d1bf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/024-regression.out
@@ -0,0 +1 @@
+NO
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.in
new file mode 100644
index 00000000..84a5a1ec
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.in
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diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.out
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index 00000000..f033a501
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.out
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diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/cases.json b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/Makefile b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/README.md b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/README.md
new file mode 100644
index 00000000..a8c33d70
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/README.md
@@ -0,0 +1,75 @@
+---
+title: "Lab 02-E-18：反转队列前 K 个元素"
+description: "借助栈反转队头前缀并保持剩余元素相对顺序。"
+order: 29
+chapter: 2
+labId: "02E18"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-18：反转队列前 K 个元素
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+借助栈反转队头前缀并保持剩余元素相对顺序。
+
+## 输入格式
+
+第一行 `n k`；第二行 `n` 个整数，`0 <= k <= n`。
+
+## 输出格式
+
+输出操作后的整个队列，各元素以单个空格分隔，末尾输出换行。
+
+## 数据范围与限制
+
+- 输入规模不超过 `200000`，除题面另有说明外整数使用 64 位有符号范围。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法应为线性或摊还线性时间，辅助空间不超过 `O(n)`。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-18-reverse-first-k-queue
+pnpm lab:run -- labs/chapter-02/exercise/E-02-18-reverse-first-k-queue
+pnpm lab:score -- labs/chapter-02/exercise/E-02-18-reverse-first-k-queue
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/lab.json b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/solution/main.cpp b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/solution/main.cpp
new file mode 100644
index 00000000..0aa8cbae
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/solution/main.cpp
@@ -0,0 +1,14 @@
+#include <cstddef>
+#include <iostream>
+#include <queue>
+#include <stack>
+
+int main() {
+    std::size_t n = 0, k = 0; if (!(std::cin >> n >> k)) return 0;
+    std::queue<long long> queue; for (std::size_t i = 0; i < n; ++i) { long long x = 0; std::cin >> x; queue.push(x); }
+    std::stack<long long> stack; for (std::size_t i = 0; i < k; ++i) { stack.push(queue.front()); queue.pop(); }
+    while (!stack.empty()) { queue.push(stack.top()); stack.pop(); }
+    for (std::size_t i = k; i < n; ++i) { queue.push(queue.front()); queue.pop(); }
+    for (std::size_t i = 0; i < n; ++i) { if (i) std::cout << ' '; std::cout << queue.front(); queue.pop(); }
+    std::cout << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/student/main.cpp b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/001-sample.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/001-sample.in
new file mode 100644
index 00000000..a7149637
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/001-sample.in
@@ -0,0 +1,2 @@
+1 0
+1
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/001-sample.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/001-sample.out
new file mode 100644
index 00000000..d00491fd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/001-sample.out
@@ -0,0 +1 @@
+1
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/002-boundary.in
new file mode 100644
index 00000000..8004acab
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/002-boundary.in
@@ -0,0 +1,2 @@
+2 1
+2 1
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/002-boundary.out
new file mode 100644
index 00000000..cba3471e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/002-boundary.out
@@ -0,0 +1 @@
+2 1
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/003-boundary.in
new file mode 100644
index 00000000..b76f1251
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/003-boundary.in
@@ -0,0 +1,2 @@
+2 2
+1 2
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/003-boundary.out
new file mode 100644
index 00000000..cba3471e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/003-boundary.out
@@ -0,0 +1 @@
+2 1
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/004-boundary.in
new file mode 100644
index 00000000..035bac8b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/004-boundary.in
@@ -0,0 +1,2 @@
+2 0
+2 2
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/004-boundary.out
new file mode 100644
index 00000000..78454aab
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/004-boundary.out
@@ -0,0 +1 @@
+2 2
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/005-boundary.in
new file mode 100644
index 00000000..b2a1e5cf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/005-boundary.in
@@ -0,0 +1,2 @@
+3 0
+2 1 2
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/005-boundary.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/005-boundary.out
new file mode 100644
index 00000000..c3b04ccd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/005-boundary.out
@@ -0,0 +1 @@
+2 1 2
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/006-normal.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/006-normal.in
new file mode 100644
index 00000000..1edb8071
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/006-normal.in
@@ -0,0 +1,2 @@
+5 5
+5 1 4 2 6
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/006-normal.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/006-normal.out
new file mode 100644
index 00000000..4c100d85
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/006-normal.out
@@ -0,0 +1 @@
+6 2 4 1 5
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/007-normal.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/007-normal.in
new file mode 100644
index 00000000..8337c068
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/007-normal.in
@@ -0,0 +1,2 @@
+6 6
+6 5 4 3 2 1
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/007-normal.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/007-normal.out
new file mode 100644
index 00000000..b61b7c26
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/007-normal.out
@@ -0,0 +1 @@
+1 2 3 4 5 6
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/008-normal.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/008-normal.in
new file mode 100644
index 00000000..991ec4a0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/008-normal.in
@@ -0,0 +1,2 @@
+6 0
+1 2 3 4 5 6
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/008-normal.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/008-normal.out
new file mode 100644
index 00000000..b61b7c26
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/008-normal.out
@@ -0,0 +1 @@
+1 2 3 4 5 6
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/009-normal.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/009-normal.in
new file mode 100644
index 00000000..edd2733c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/009-normal.in
@@ -0,0 +1,2 @@
+4 3
+-1 -3 -2 -4
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/009-normal.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/009-normal.out
new file mode 100644
index 00000000..d2f68ace
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/009-normal.out
@@ -0,0 +1 @@
+-2 -3 -1 -4
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/010-normal.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/010-normal.in
new file mode 100644
index 00000000..7c9ea445
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/010-normal.in
@@ -0,0 +1,2 @@
+4 4
+0 0 0 0
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/010-normal.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/010-normal.out
new file mode 100644
index 00000000..6a20ce40
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/010-normal.out
@@ -0,0 +1 @@
+0 0 0 0
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/011-normal.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/011-normal.in
new file mode 100644
index 00000000..b349a63e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/011-normal.in
@@ -0,0 +1,2 @@
+5 4
+7 1 7 1 7
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/011-normal.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/011-normal.out
new file mode 100644
index 00000000..ba962b93
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/011-normal.out
@@ -0,0 +1 @@
+1 7 1 7 7
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/012-normal.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/012-normal.in
new file mode 100644
index 00000000..22971fc6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/012-normal.in
@@ -0,0 +1,2 @@
+6 4
+3 8 2 9 1 10
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/012-normal.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/012-normal.out
new file mode 100644
index 00000000..d9bf442c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/012-normal.out
@@ -0,0 +1 @@
+9 2 8 3 1 10
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/013-normal.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/013-normal.in
new file mode 100644
index 00000000..a988c109
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/013-normal.in
@@ -0,0 +1,2 @@
+5 0
+10 9 8 7 6
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/013-normal.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/013-normal.out
new file mode 100644
index 00000000..271bb735
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/013-normal.out
@@ -0,0 +1 @@
+10 9 8 7 6
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/014-normal.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/014-normal.in
new file mode 100644
index 00000000..325c0e0b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/014-normal.in
@@ -0,0 +1,2 @@
+5 1
+4 1 2 3 0
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/014-normal.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/014-normal.out
new file mode 100644
index 00000000..93f533b2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/014-normal.out
@@ -0,0 +1 @@
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diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/015-normal.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/015-normal.in
new file mode 100644
index 00000000..040619ca
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/015-normal.in
@@ -0,0 +1,2 @@
+5 2
+100 -100 50 -50 0
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/015-normal.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/015-normal.out
new file mode 100644
index 00000000..a0245e06
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/015-normal.out
@@ -0,0 +1 @@
+-100 100 50 -50 0
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/016-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/016-regression.in
new file mode 100644
index 00000000..e760cbc7
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/016-regression.in
@@ -0,0 +1,2 @@
+7 7
+9 1 8 2 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/016-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/016-regression.out
new file mode 100644
index 00000000..c796e597
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/016-regression.out
@@ -0,0 +1 @@
+6 3 7 2 8 1 9
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/017-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/017-regression.in
new file mode 100644
index 00000000..73ebdb90
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/017-regression.in
@@ -0,0 +1,2 @@
+6 2
+1 3 2 4 3 5
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/017-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/017-regression.out
new file mode 100644
index 00000000..62f559e9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/017-regression.out
@@ -0,0 +1 @@
+3 1 2 4 3 5
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/018-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/018-regression.in
new file mode 100644
index 00000000..55228578
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/018-regression.in
@@ -0,0 +1,2 @@
+6 3
+5 5 4 4 3 3
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/018-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/018-regression.out
new file mode 100644
index 00000000..8bfdcdd4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/018-regression.out
@@ -0,0 +1 @@
+4 5 5 4 3 3
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/019-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/019-regression.in
new file mode 100644
index 00000000..cfd03c32
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/019-regression.in
@@ -0,0 +1,2 @@
+6 4
+2 9 1 8 0 7
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/019-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/019-regression.out
new file mode 100644
index 00000000..62beeb68
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/019-regression.out
@@ -0,0 +1 @@
+8 1 9 2 0 7
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/020-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/020-regression.in
new file mode 100644
index 00000000..75a307d9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/020-regression.in
@@ -0,0 +1,2 @@
+7 3
+11 4 12 3 13 2 14
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/020-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/020-regression.out
new file mode 100644
index 00000000..9f1188f0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/020-regression.out
@@ -0,0 +1 @@
+12 4 11 3 13 2 14
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.in
new file mode 100644
index 00000000..9285c1f8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.in
@@ -0,0 +1,2 @@
+4 0
+1000000000 -1000000000 0 999999999
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.out
new file mode 100644
index 00000000..5c4864af
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.out
@@ -0,0 +1 @@
+1000000000 -1000000000 0 999999999
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.in
new file mode 100644
index 00000000..54c7ce05
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.in
@@ -0,0 +1,2 @@
+6 0
+6 2 5 1 4 3
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.out
new file mode 100644
index 00000000..87afb280
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.out
@@ -0,0 +1 @@
+6 2 5 1 4 3
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.in
new file mode 100644
index 00000000..8f8a6e90
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.in
@@ -0,0 +1,2 @@
+7 6
+8 6 7 5 3 0 9
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.out
new file mode 100644
index 00000000..c86268c2
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.out
@@ -0,0 +1 @@
+0 3 5 7 6 8 9
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.in
new file mode 100644
index 00000000..41ef7d07
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.in
@@ -0,0 +1,2 @@
+8 5
+1 4 2 8 5 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.out
new file mode 100644
index 00000000..758425dc
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.out
@@ -0,0 +1 @@
+5 8 2 4 1 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.in
new file mode 100644
index 00000000..2ab8bca1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.in
@@ -0,0 +1,2 @@
+7 0
+12 1 11 2 10 3 9
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.out
new file mode 100644
index 00000000..83e41fbe
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.out
@@ -0,0 +1 @@
+12 1 11 2 10 3 9
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/cases.json b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/Makefile b/labs/chapter-02/exercise/E-02-19-stack-sorting/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/README.md b/labs/chapter-02/exercise/E-02-19-stack-sorting/README.md
new file mode 100644
index 00000000..7894e9b9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/README.md
@@ -0,0 +1,76 @@
+---
+title: "Lab 02-E-19：仅用辅助栈排序"
+description: "用一个辅助栈完成整数序列的升序输出。"
+order: 30
+chapter: 2
+labId: "02E19"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-19：仅用辅助栈排序
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+用一个辅助栈完成整数序列的升序输出。
+
+## 输入格式
+
+第一行 `n`；第二行 `n` 个整数，按给定顺序依次入栈。
+
+## 输出格式
+
+输出从小到大的排序结果，各元素以单个空格分隔，末尾输出换行。
+
+## 数据范围与限制
+
+- 除题面另有说明外整数使用 64 位有符号范围。
+- `0 <= n <= 5000`；仅允许使用输入栈和一个辅助栈完成排序，栈排序最坏时间为 `O(n^2)`，辅助空间为 `O(n)`。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法使用一个辅助栈完成排序，最坏时间 `O(n^2)`，辅助空间不超过 `O(n)`。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-19-stack-sorting
+pnpm lab:run -- labs/chapter-02/exercise/E-02-19-stack-sorting
+pnpm lab:score -- labs/chapter-02/exercise/E-02-19-stack-sorting
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/lab.json b/labs/chapter-02/exercise/E-02-19-stack-sorting/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/solution/main.cpp b/labs/chapter-02/exercise/E-02-19-stack-sorting/solution/main.cpp
new file mode 100644
index 00000000..803e4398
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/solution/main.cpp
@@ -0,0 +1,22 @@
+#include <cstddef>
+#include <iostream>
+#include <stack>
+
+int main() {
+    std::size_t n = 0; if (!(std::cin >> n)) return 0;
+    std::stack<long long> source, helper;
+    for (std::size_t i = 0; i < n; ++i) { long long x = 0; std::cin >> x; source.push(x); }
+    while (!source.empty()) {
+        const long long current = source.top(); source.pop();
+        while (!helper.empty() && helper.top() > current) { source.push(helper.top()); helper.pop(); }
+        helper.push(current);
+    }
+    // Move the sorted stack back to the input stack so its top is the smallest value.
+    while (!helper.empty()) { source.push(helper.top()); helper.pop(); }
+    for (std::size_t i = 0; i < n; ++i) {
+        if (i) std::cout << ' ';
+        std::cout << source.top();
+        source.pop();
+    }
+    std::cout << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/student/main.cpp b/labs/chapter-02/exercise/E-02-19-stack-sorting/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/001-sample.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/001-sample.in
new file mode 100644
index 00000000..6ed281c7
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/001-sample.in
@@ -0,0 +1,2 @@
+1
+1
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/001-sample.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/001-sample.out
new file mode 100644
index 00000000..d00491fd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/001-sample.out
@@ -0,0 +1 @@
+1
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/002-boundary.in
new file mode 100644
index 00000000..65cd4f58
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/002-boundary.in
@@ -0,0 +1,2 @@
+2
+2 1
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/002-boundary.out
new file mode 100644
index 00000000..8d04f961
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/002-boundary.out
@@ -0,0 +1 @@
+1 2
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/003-boundary.in
new file mode 100644
index 00000000..a789e877
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/003-boundary.in
@@ -0,0 +1,2 @@
+2
+1 2
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/003-boundary.out
new file mode 100644
index 00000000..8d04f961
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/003-boundary.out
@@ -0,0 +1 @@
+1 2
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/004-boundary.in
new file mode 100644
index 00000000..2d777856
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/004-boundary.in
@@ -0,0 +1,2 @@
+2
+2 2
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/004-boundary.out
new file mode 100644
index 00000000..78454aab
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/004-boundary.out
@@ -0,0 +1 @@
+2 2
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/005-boundary.in
new file mode 100644
index 00000000..8b98c7f1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/005-boundary.in
@@ -0,0 +1,2 @@
+3
+2 1 2
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/005-boundary.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/005-boundary.out
new file mode 100644
index 00000000..43cebf1d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/005-boundary.out
@@ -0,0 +1 @@
+1 2 2
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/006-normal.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/006-normal.in
new file mode 100644
index 00000000..cca7fe34
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/006-normal.in
@@ -0,0 +1,2 @@
+5
+5 1 4 2 6
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/006-normal.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/006-normal.out
new file mode 100644
index 00000000..2dae32d1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/006-normal.out
@@ -0,0 +1 @@
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diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/007-normal.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/007-normal.in
new file mode 100644
index 00000000..8db8ab6d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/007-normal.in
@@ -0,0 +1,2 @@
+6
+6 5 4 3 2 1
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/007-normal.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/007-normal.out
new file mode 100644
index 00000000..b61b7c26
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/007-normal.out
@@ -0,0 +1 @@
+1 2 3 4 5 6
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/008-normal.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/008-normal.in
new file mode 100644
index 00000000..5ee886e1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/008-normal.in
@@ -0,0 +1,2 @@
+6
+1 2 3 4 5 6
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/008-normal.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/008-normal.out
new file mode 100644
index 00000000..b61b7c26
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/008-normal.out
@@ -0,0 +1 @@
+1 2 3 4 5 6
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/009-normal.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/009-normal.in
new file mode 100644
index 00000000..5aab6eaa
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/009-normal.in
@@ -0,0 +1,2 @@
+4
+-1 -3 -2 -4
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/009-normal.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/009-normal.out
new file mode 100644
index 00000000..1190f593
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/009-normal.out
@@ -0,0 +1 @@
+-4 -3 -2 -1
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/010-normal.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/010-normal.in
new file mode 100644
index 00000000..3f62807b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/010-normal.in
@@ -0,0 +1,2 @@
+4
+0 0 0 0
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/010-normal.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/010-normal.out
new file mode 100644
index 00000000..6a20ce40
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/010-normal.out
@@ -0,0 +1 @@
+0 0 0 0
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/011-normal.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/011-normal.in
new file mode 100644
index 00000000..481b7578
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/011-normal.in
@@ -0,0 +1,2 @@
+5
+7 1 7 1 7
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/011-normal.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/011-normal.out
new file mode 100644
index 00000000..3944c011
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/011-normal.out
@@ -0,0 +1 @@
+1 1 7 7 7
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/012-normal.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/012-normal.in
new file mode 100644
index 00000000..824a30e0
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/012-normal.in
@@ -0,0 +1,2 @@
+6
+3 8 2 9 1 10
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/012-normal.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/012-normal.out
new file mode 100644
index 00000000..3e5f0b1b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/012-normal.out
@@ -0,0 +1 @@
+1 2 3 8 9 10
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/013-normal.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/013-normal.in
new file mode 100644
index 00000000..ece8fbdb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/013-normal.in
@@ -0,0 +1,2 @@
+5
+10 9 8 7 6
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/013-normal.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/013-normal.out
new file mode 100644
index 00000000..2134a099
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/013-normal.out
@@ -0,0 +1 @@
+6 7 8 9 10
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/014-normal.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/014-normal.in
new file mode 100644
index 00000000..8215b61b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/014-normal.in
@@ -0,0 +1,2 @@
+5
+4 1 2 3 0
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/014-normal.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/014-normal.out
new file mode 100644
index 00000000..926717b1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/014-normal.out
@@ -0,0 +1 @@
+0 1 2 3 4
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/015-normal.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/015-normal.in
new file mode 100644
index 00000000..73c8c8e6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/015-normal.in
@@ -0,0 +1,2 @@
+5
+100 -100 50 -50 0
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/015-normal.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/015-normal.out
new file mode 100644
index 00000000..29be3a41
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/015-normal.out
@@ -0,0 +1 @@
+-100 -50 0 50 100
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/016-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/016-regression.in
new file mode 100644
index 00000000..430eb31e
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/016-regression.in
@@ -0,0 +1,2 @@
+7
+9 1 8 2 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/016-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/016-regression.out
new file mode 100644
index 00000000..20c03c80
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/016-regression.out
@@ -0,0 +1 @@
+1 2 3 6 7 8 9
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/017-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/017-regression.in
new file mode 100644
index 00000000..49184691
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/017-regression.in
@@ -0,0 +1,2 @@
+6
+1 3 2 4 3 5
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/017-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/017-regression.out
new file mode 100644
index 00000000..4faad4da
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/017-regression.out
@@ -0,0 +1 @@
+1 2 3 3 4 5
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/018-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/018-regression.in
new file mode 100644
index 00000000..efa0c2e6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/018-regression.in
@@ -0,0 +1,2 @@
+6
+5 5 4 4 3 3
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/018-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/018-regression.out
new file mode 100644
index 00000000..57fdeec7
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/018-regression.out
@@ -0,0 +1 @@
+3 3 4 4 5 5
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/019-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/019-regression.in
new file mode 100644
index 00000000..cfc22005
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/019-regression.in
@@ -0,0 +1,2 @@
+6
+2 9 1 8 0 7
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/019-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/019-regression.out
new file mode 100644
index 00000000..2096d765
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/019-regression.out
@@ -0,0 +1 @@
+0 1 2 7 8 9
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/020-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/020-regression.in
new file mode 100644
index 00000000..08c96f86
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/020-regression.in
@@ -0,0 +1,2 @@
+7
+11 4 12 3 13 2 14
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/020-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/020-regression.out
new file mode 100644
index 00000000..e95d80dc
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/020-regression.out
@@ -0,0 +1 @@
+2 3 4 11 12 13 14
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.in
new file mode 100644
index 00000000..4d4937eb
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.in
@@ -0,0 +1,2 @@
+4
+1000000000 -1000000000 0 999999999
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.out
new file mode 100644
index 00000000..547e1bb1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.out
@@ -0,0 +1 @@
+-1000000000 0 999999999 1000000000
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.in
new file mode 100644
index 00000000..35ef900d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.in
@@ -0,0 +1,2 @@
+6
+6 2 5 1 4 3
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.out
new file mode 100644
index 00000000..b61b7c26
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.out
@@ -0,0 +1 @@
+1 2 3 4 5 6
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.in
new file mode 100644
index 00000000..bfb0c78d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.in
@@ -0,0 +1,2 @@
+7
+8 6 7 5 3 0 9
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.out
new file mode 100644
index 00000000..7a92ea75
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.out
@@ -0,0 +1 @@
+0 3 5 6 7 8 9
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.in
new file mode 100644
index 00000000..5cc603ce
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.in
@@ -0,0 +1,2 @@
+8
+1 4 2 8 5 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.out
new file mode 100644
index 00000000..1f5ace83
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.out
@@ -0,0 +1 @@
+1 2 3 4 5 6 7 8
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.in
new file mode 100644
index 00000000..8f46cfea
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.in
@@ -0,0 +1,2 @@
+7
+12 1 11 2 10 3 9
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.out
new file mode 100644
index 00000000..cb63d762
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.out
@@ -0,0 +1 @@
+1 2 3 9 10 11 12
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/cases.json b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/Makefile b/labs/chapter-02/exercise/E-02-20-stock-span/Makefile
new file mode 100644
index 00000000..314d5329
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/Makefile
@@ -0,0 +1,3 @@
+LAB_DIR := $(CURDIR)
+REPO_ROOT := $(LAB_DIR)/../../../..
+include ../../../../tools/lab/lab.mk
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/README.md b/labs/chapter-02/exercise/E-02-20-stock-span/README.md
new file mode 100644
index 00000000..c1531b74
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/README.md
@@ -0,0 +1,76 @@
+---
+title: "Lab 02-E-20：股票价格跨度"
+description: "用单调栈计算连续不高于当天价格的天数。"
+order: 31
+chapter: 2
+labId: "02E20"
+chapterTitle: "栈与队列"
+updated: "2026-09-11"
+contributors: ["DSA Mastery Team"]
+status: "draft"
+lab: true
+difficulty: "基础"
+duration: "35～50 分钟"
+---
+
+# Lab 02-E-20：股票价格跨度
+
+## 学习目标
+
+- 用栈、队列或双端队列维护本题要求的访问顺序。
+- 处理正常、边界和失败/非法输入场景。
+- 说明每个元素至多进入和离开辅助结构一次的复杂度原因。
+
+## 前置知识与环境
+
+建议先学习[第 2 章栈与队列](../../../../content/chapter-02-stack-queue/00-overview.md)。使用 ISO C++17；开始前可在本目录运行 `make doctor`。
+
+## 任务
+
+用单调栈计算连续不高于当天价格的天数。
+
+## 输入格式
+
+第一行 `n`；第二行 `n` 个正整数价格。
+
+## 输出格式
+
+输出每一天的价格跨度，各数值以单个空格分隔，末尾输出换行。
+
+## 数据范围与限制
+
+- `1 <= n <= 200000`，且每个价格为正整数。
+- 输入规模不超过 `200000`，除题面另有说明外整数使用 64 位有符号范围。
+- 标准输出只保留题目要求的结果；调试信息写入标准错误。
+- 目标算法应为线性或摊还线性时间，辅助空间不超过 `O(n)`。
+
+## 边界与验收重点
+
+- 最小规模、单元素和重复元素。
+- 结构为空、候选全部过期或没有可匹配对象的情况。
+- 极值、嵌套结构和混合操作后的状态一致性。
+
+## 如何验证
+
+```powershell
+make doctor
+make run
+make score
+```
+
+未安装 Make 时，在仓库根目录运行：
+
+```powershell
+pnpm lab:validate -- labs/chapter-02/exercise/E-02-20-stock-span
+pnpm lab:run -- labs/chapter-02/exercise/E-02-20-stock-span
+pnpm lab:score -- labs/chapter-02/exercise/E-02-20-stock-span
+```
+
+- [ ] 全部 25 个公开测试通过。
+- [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
+- [ ] 能说明最坏或摊还时间复杂度。
+
+## 思考与复盘
+
+1. 若把本题核心结构换成相反的访问顺序，会在哪类输入上出错？
+2. 哪个边界用例最能揭示结构不变量被破坏？
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/lab.json b/labs/chapter-02/exercise/E-02-20-stock-span/lab.json
new file mode 100644
index 00000000..34bbd148
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/lab.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "../../../../schemas/lab.schema.json",
+  "schemaVersion": 1,
+  "type": "program",
+  "language": "cpp",
+  "toolchain": {
+    "standard": "c++17",
+    "profile": "course-default"
+  },
+  "targets": {
+    "student": {
+      "sources": [
+        "student/main.cpp"
+      ]
+    },
+    "solution": {
+      "sources": [
+        "solution/main.cpp"
+      ]
+    }
+  },
+  "judge": {
+    "kind": "stdio",
+    "cases": "tests/cases.json",
+    "compare": {
+      "mode": "tokens"
+    },
+    "limits": {
+      "timeMs": 2000,
+      "outputKb": 1024
+    }
+  }
+}
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/solution/main.cpp b/labs/chapter-02/exercise/E-02-20-stock-span/solution/main.cpp
new file mode 100644
index 00000000..42cada5f
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/solution/main.cpp
@@ -0,0 +1,15 @@
+#include <cstddef>
+#include <iostream>
+#include <vector>
+
+int main() {
+    std::size_t n = 0; if (!(std::cin >> n)) return 0;
+    std::vector<long long> price(n); std::vector<std::size_t> stack;
+    for (auto& x : price) std::cin >> x;
+    for (std::size_t i = 0; i < n; ++i) {
+        while (!stack.empty() && price[stack.back()] <= price[i]) stack.pop_back();
+        const std::size_t span = stack.empty() ? i + 1 : i - stack.back();
+        if (i) std::cout << ' '; std::cout << span; stack.push_back(i);
+    }
+    std::cout << '\n';
+}
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/student/main.cpp b/labs/chapter-02/exercise/E-02-20-stock-span/student/main.cpp
new file mode 100644
index 00000000..701993a6
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/student/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    // TODO: 读取输入并完成任务。学生骨架应可编译，但不能直接得到满分。
+    return 0;
+}
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/001-sample.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/001-sample.in
new file mode 100644
index 00000000..1191247b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/001-sample.in
@@ -0,0 +1,2 @@
+1
+2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/001-sample.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/001-sample.out
new file mode 100644
index 00000000..d00491fd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/001-sample.out
@@ -0,0 +1 @@
+1
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/002-boundary.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/002-boundary.in
new file mode 100644
index 00000000..9f411815
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/002-boundary.in
@@ -0,0 +1,2 @@
+2
+3 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/002-boundary.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/002-boundary.out
new file mode 100644
index 00000000..2fb73a07
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/002-boundary.out
@@ -0,0 +1 @@
+1 1
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/003-boundary.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/003-boundary.in
new file mode 100644
index 00000000..c6b80dc1
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/003-boundary.in
@@ -0,0 +1,2 @@
+2
+2 3
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/003-boundary.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/003-boundary.out
new file mode 100644
index 00000000..8d04f961
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/003-boundary.out
@@ -0,0 +1 @@
+1 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/004-boundary.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/004-boundary.in
new file mode 100644
index 00000000..da7e2683
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/004-boundary.in
@@ -0,0 +1,2 @@
+2
+3 3
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/004-boundary.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/004-boundary.out
new file mode 100644
index 00000000..8d04f961
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/004-boundary.out
@@ -0,0 +1 @@
+1 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/005-boundary.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/005-boundary.in
new file mode 100644
index 00000000..60255dc3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/005-boundary.in
@@ -0,0 +1,2 @@
+3
+3 2 3
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/005-boundary.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/005-boundary.out
new file mode 100644
index 00000000..363c9123
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/005-boundary.out
@@ -0,0 +1 @@
+1 1 3
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/006-normal.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/006-normal.in
new file mode 100644
index 00000000..1d932d58
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/006-normal.in
@@ -0,0 +1,2 @@
+5
+6 2 5 3 7
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/006-normal.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/006-normal.out
new file mode 100644
index 00000000..f3f497b4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/006-normal.out
@@ -0,0 +1 @@
+1 1 2 1 5
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/007-normal.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/007-normal.in
new file mode 100644
index 00000000..d519b4f4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/007-normal.in
@@ -0,0 +1,2 @@
+6
+7 6 5 4 3 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/007-normal.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/007-normal.out
new file mode 100644
index 00000000..73c3ca10
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/007-normal.out
@@ -0,0 +1 @@
+1 1 1 1 1 1
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/008-normal.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/008-normal.in
new file mode 100644
index 00000000..9857460a
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/008-normal.in
@@ -0,0 +1,2 @@
+6
+2 3 4 5 6 7
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/008-normal.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/008-normal.out
new file mode 100644
index 00000000..b61b7c26
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/008-normal.out
@@ -0,0 +1 @@
+1 2 3 4 5 6
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/009-normal.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/009-normal.in
new file mode 100644
index 00000000..5ce6e0a9
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/009-normal.in
@@ -0,0 +1,2 @@
+4
+2 4 3 5
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/009-normal.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/009-normal.out
new file mode 100644
index 00000000..e8d7cd80
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/009-normal.out
@@ -0,0 +1 @@
+1 2 1 4
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/010-normal.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/010-normal.in
new file mode 100644
index 00000000..6c95aee8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/010-normal.in
@@ -0,0 +1,2 @@
+4
+1 1 1 1
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/010-normal.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/010-normal.out
new file mode 100644
index 00000000..93a48451
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/010-normal.out
@@ -0,0 +1 @@
+1 2 3 4
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/011-normal.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/011-normal.in
new file mode 100644
index 00000000..243d2fdf
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/011-normal.in
@@ -0,0 +1,2 @@
+5
+8 2 8 2 8
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/011-normal.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/011-normal.out
new file mode 100644
index 00000000..e4407ba8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/011-normal.out
@@ -0,0 +1 @@
+1 1 3 1 5
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/012-normal.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/012-normal.in
new file mode 100644
index 00000000..61d64a95
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/012-normal.in
@@ -0,0 +1,2 @@
+6
+4 9 3 10 2 11
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/012-normal.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/012-normal.out
new file mode 100644
index 00000000..3e81cfbd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/012-normal.out
@@ -0,0 +1 @@
+1 2 1 4 1 6
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/013-normal.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/013-normal.in
new file mode 100644
index 00000000..2e1b7a4d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/013-normal.in
@@ -0,0 +1,2 @@
+5
+11 10 9 8 7
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/013-normal.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/013-normal.out
new file mode 100644
index 00000000..ac7d099c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/013-normal.out
@@ -0,0 +1 @@
+1 1 1 1 1
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/014-normal.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/014-normal.in
new file mode 100644
index 00000000..be94e490
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/014-normal.in
@@ -0,0 +1,2 @@
+5
+5 2 3 4 1
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/014-normal.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/014-normal.out
new file mode 100644
index 00000000..25af3a39
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/014-normal.out
@@ -0,0 +1 @@
+1 1 2 3 1
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/015-normal.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/015-normal.in
new file mode 100644
index 00000000..7ceea766
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/015-normal.in
@@ -0,0 +1,2 @@
+5
+101 101 51 51 1
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/015-normal.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/015-normal.out
new file mode 100644
index 00000000..7679d27d
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/015-normal.out
@@ -0,0 +1 @@
+1 2 1 2 1
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/016-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/016-regression.in
new file mode 100644
index 00000000..1a146b89
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/016-regression.in
@@ -0,0 +1,2 @@
+7
+10 2 9 3 8 4 7
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/016-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/016-regression.out
new file mode 100644
index 00000000..a073493c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/016-regression.out
@@ -0,0 +1 @@
+1 1 2 1 2 1 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/017-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/017-regression.in
new file mode 100644
index 00000000..fe1b80aa
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/017-regression.in
@@ -0,0 +1,2 @@
+6
+2 4 3 5 4 6
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/017-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/017-regression.out
new file mode 100644
index 00000000..3e81cfbd
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/017-regression.out
@@ -0,0 +1 @@
+1 2 1 4 1 6
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/018-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/018-regression.in
new file mode 100644
index 00000000..4de578f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/018-regression.in
@@ -0,0 +1,2 @@
+6
+6 6 5 5 4 4
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/018-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/018-regression.out
new file mode 100644
index 00000000..c4bc6443
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/018-regression.out
@@ -0,0 +1 @@
+1 2 1 2 1 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/019-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/019-regression.in
new file mode 100644
index 00000000..7a0bff9b
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/019-regression.in
@@ -0,0 +1,2 @@
+6
+3 10 2 9 1 8
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/019-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/019-regression.out
new file mode 100644
index 00000000..c4bc6443
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/019-regression.out
@@ -0,0 +1 @@
+1 2 1 2 1 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/020-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/020-regression.in
new file mode 100644
index 00000000..5bff3c53
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/020-regression.in
@@ -0,0 +1,2 @@
+7
+12 5 13 4 14 3 15
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/020-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/020-regression.out
new file mode 100644
index 00000000..a5cb6a04
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/020-regression.out
@@ -0,0 +1 @@
+1 1 3 1 5 1 7
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.in
new file mode 100644
index 00000000..a5db4f61
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.in
@@ -0,0 +1,2 @@
+4
+1000000001 1000000001 1 1000000000
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.out
new file mode 100644
index 00000000..24f529d4
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.out
@@ -0,0 +1 @@
+1 2 1 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.in
new file mode 100644
index 00000000..325f4108
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.in
@@ -0,0 +1,2 @@
+6
+7 3 6 2 5 4
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.out
new file mode 100644
index 00000000..8c032f26
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.out
@@ -0,0 +1 @@
+1 1 2 1 2 1
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.in
new file mode 100644
index 00000000..9987e979
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.in
@@ -0,0 +1,2 @@
+7
+9 7 8 6 4 1 10
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.out
new file mode 100644
index 00000000..4386e890
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.out
@@ -0,0 +1 @@
+1 1 2 1 1 1 7
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.in
new file mode 100644
index 00000000..cc8d5576
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.in
@@ -0,0 +1,2 @@
+8
+2 5 3 9 6 8 4 7
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.out
new file mode 100644
index 00000000..c852a611
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.out
@@ -0,0 +1 @@
+1 2 1 4 1 2 1 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.in
new file mode 100644
index 00000000..dc0bfec8
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.in
@@ -0,0 +1,2 @@
+7
+13 2 12 3 11 4 10
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.out
new file mode 100644
index 00000000..a073493c
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.out
@@ -0,0 +1 @@
+1 1 2 1 2 1 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/cases.json b/labs/chapter-02/exercise/E-02-20-stock-span/tests/cases.json
new file mode 100644
index 00000000..1b4834f3
--- /dev/null
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/cases.json
@@ -0,0 +1,227 @@
+[
+  {
+    "id": "001-sample",
+    "input": "tests/001-sample.in",
+    "expected": "tests/001-sample.out",
+    "points": 8,
+    "tags": [
+      "sample"
+    ]
+  },
+  {
+    "id": "002-boundary",
+    "input": "tests/002-boundary.in",
+    "expected": "tests/002-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "003-boundary",
+    "input": "tests/003-boundary.in",
+    "expected": "tests/003-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "004-boundary",
+    "input": "tests/004-boundary.in",
+    "expected": "tests/004-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "005-boundary",
+    "input": "tests/005-boundary.in",
+    "expected": "tests/005-boundary.out",
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "006-normal",
+    "input": "tests/006-normal.in",
+    "expected": "tests/006-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "007-normal",
+    "input": "tests/007-normal.in",
+    "expected": "tests/007-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "008-normal",
+    "input": "tests/008-normal.in",
+    "expected": "tests/008-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-normal",
+    "input": "tests/009-normal.in",
+    "expected": "tests/009-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-normal",
+    "input": "tests/010-normal.in",
+    "expected": "tests/010-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-normal",
+    "input": "tests/011-normal.in",
+    "expected": "tests/011-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-normal",
+    "input": "tests/012-normal.in",
+    "expected": "tests/012-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-normal",
+    "input": "tests/013-normal.in",
+    "expected": "tests/013-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-normal",
+    "input": "tests/014-normal.in",
+    "expected": "tests/014-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-normal",
+    "input": "tests/015-normal.in",
+    "expected": "tests/015-normal.out",
+    "points": 3,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-regression",
+    "input": "tests/016-regression.in",
+    "expected": "tests/016-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "017-regression",
+    "input": "tests/017-regression.in",
+    "expected": "tests/017-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-regression",
+    "input": "tests/018-regression.in",
+    "expected": "tests/018-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-regression",
+    "input": "tests/019-regression.in",
+    "expected": "tests/019-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-regression",
+    "input": "tests/020-regression.in",
+    "expected": "tests/020-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "021-regression",
+    "input": "tests/021-regression.in",
+    "expected": "tests/021-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "022-regression",
+    "input": "tests/022-regression.in",
+    "expected": "tests/022-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "023-regression",
+    "input": "tests/023-regression.in",
+    "expected": "tests/023-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "024-regression",
+    "input": "tests/024-regression.in",
+    "expected": "tests/024-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "025-regression",
+    "input": "tests/025-regression.in",
+    "expected": "tests/025-regression.out",
+    "points": 3,
+    "tags": [
+      "regression"
+    ]
+  }
+]

From aeb715f9cdba6be85ac8afbf9a09c0bc07c1bede Mon Sep 17 00:00:00 2001
From: Jeff <3242284158@qq.com>
Date: Sat, 12 Sep 2026 10:07:50 +0800
Subject: [PATCH 2/3] modified_exercises

---
 .../tests/021-blockwise-valid.in              |   3 -
 .../tests/021-blockwise-valid.out             |   1 -
 .../tests/022-invalid-late-top.in             |   3 -
 .../tests/022-invalid-late-top.out            |   1 -
 .../tests/023-negative-valid.in               |   3 -
 .../tests/023-negative-valid.out              |   1 -
 .../tests/024-three-blocks.in                 |   3 -
 .../tests/024-three-blocks.out                |   1 -
 .../tests/025-invalid-final-block.in          |   3 -
 .../tests/025-invalid-final-block.out         |   1 -
 .../tests/cases.json                          | 149 ++++++++++++---
 .../tests/021-duplicate-churn.in              |  17 --
 .../tests/021-duplicate-churn.out             |  11 --
 .../tests/022-transfer-like-sequence.in       |  19 --
 .../tests/022-transfer-like-sequence.out      |  14 --
 .../tests/023-size-after-failures.in          |  13 --
 .../tests/023-size-after-failures.out         |  11 --
 .../tests/024-large-positive.in               |  12 --
 .../tests/024-large-positive.out              |   8 -
 .../tests/025-long-minimum-chain.in           |  21 ---
 .../tests/025-long-minimum-chain.out          |  15 --
 .../E-02-02-min-stack/tests/cases.json        | 151 ++++++++++++---
 .../tests/021-regular-spacing.in              |   2 -
 .../tests/021-regular-spacing.out             |   1 -
 .../tests/022-long-gap.in                     |   2 -
 .../tests/022-long-gap.out                    |   1 -
 .../tests/023-large-timestamps.in             |   2 -
 .../tests/023-large-timestamps.out            |   1 -
 .../tests/024-boundary-reentry.in             |   2 -
 .../tests/024-boundary-reentry.out            |   1 -
 .../tests/025-stepped-expiry.in               |   2 -
 .../tests/025-stepped-expiry.out              |   1 -
 .../E-02-03-recent-counter/tests/cases.json   | 158 +++++++++++++---
 .../tests/021-failed-enqueues.in              |  17 --
 .../tests/021-failed-enqueues.out             |  15 --
 .../tests/022-negative-cycle.in               |  14 --
 .../tests/022-negative-cycle.out              |  12 --
 .../tests/023-empty-status.in                 |  13 --
 .../tests/023-empty-status.out                |  11 --
 .../tests/024-reuse-after-wrap.in             |  14 --
 .../tests/024-reuse-after-wrap.out            |  12 --
 .../tests/025-large-values.in                 |  14 --
 .../tests/025-large-values.out                |  12 --
 .../E-02-04-circular-queue/tests/cases.json   | 159 +++++++++++++---
 .../tests/021-size-tracking.in                |  13 --
 .../tests/021-size-tracking.out               |  10 -
 .../tests/022-interleaved-transfers.in        |  14 --
 .../tests/022-interleaved-transfers.out       |   8 -
 .../tests/023-singleton-repeated.in           |  10 -
 .../tests/023-singleton-repeated.out          |   7 -
 .../tests/024-large-values.in                 |  12 --
 .../tests/024-large-values.out                |   8 -
 .../tests/025-front-stability.in              |  12 --
 .../tests/025-front-stability.out             |   9 -
 .../tests/cases.json                          | 159 +++++++++++++---
 .../tests/021-failed-inserts.in               |  17 --
 .../tests/021-failed-inserts.out              |  15 --
 .../tests/022-negative-cycle.in               |  14 --
 .../tests/022-negative-cycle.out              |  12 --
 .../tests/023-empty-status.in                 |  14 --
 .../tests/023-empty-status.out                |  12 --
 .../tests/024-reuse-after-wrap.in             |  14 --
 .../tests/024-reuse-after-wrap.out            |  12 --
 .../tests/025-large-values.in                 |  14 --
 .../tests/025-large-values.out                |  12 --
 .../E-02-06-circular-deque/tests/cases.json   | 158 +++++++++++++---
 .../tests/021-single-element.in               |   3 -
 .../tests/021-single-element.out              |   1 -
 .../tests/022-wide-mixed.in                   |   3 -
 .../tests/022-wide-mixed.out                  |   1 -
 .../tests/023-repeated-maxima.in              |   3 -
 .../tests/023-repeated-maxima.out             |   1 -
 .../tests/024-large-range.in                  |   3 -
 .../tests/024-large-range.out                 |   1 -
 .../tests/025-decreasing-window.in            |   3 -
 .../tests/025-decreasing-window.out           |   1 -
 .../tests/cases.json                          | 176 ++++++++++++++----
 .../tests/021-large-flat.in                   |   2 -
 .../tests/021-large-flat.out                  |   1 -
 .../tests/022-alternating-heights.in          |   2 -
 .../tests/022-alternating-heights.out         |   1 -
 .../tests/023-double-plateau.in               |   2 -
 .../tests/023-double-plateau.out              |   1 -
 .../tests/024-zero-edges.in                   |   2 -
 .../tests/024-zero-edges.out                  |   1 -
 .../tests/025-large-mixed.in                  |   2 -
 .../tests/025-large-mixed.out                 |   1 -
 .../tests/cases.json                          | 170 +++++++++++++----
 .../E-02-09-bracket-matching/README.md        |   2 +-
 .../tests/021-regression.in                   |   1 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   1 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   1 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   1 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   1 -
 .../tests/025-regression.out                  |   1 -
 .../E-02-09-bracket-matching/tests/cases.json |  75 ++------
 .../exercise/E-02-10-rpn-evaluation/README.md |   2 +-
 .../tests/021-regression.in                   |   2 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   2 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   2 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   2 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   2 -
 .../tests/025-regression.out                  |   1 -
 .../E-02-10-rpn-evaluation/tests/cases.json   |  75 ++------
 .../E-02-11-infix-to-postfix/README.md        |   2 +-
 .../tests/021-regression.in                   |   1 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   1 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   1 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   1 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   1 -
 .../tests/025-regression.out                  |   1 -
 .../E-02-11-infix-to-postfix/tests/cases.json |  75 ++------
 .../E-02-12-next-greater-element/README.md    |   2 +-
 .../tests/021-regression.in                   |   2 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   2 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   2 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   2 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   2 -
 .../tests/025-regression.out                  |   1 -
 .../tests/cases.json                          |  75 ++------
 .../E-02-13-next-smaller-element/README.md    |   2 +-
 .../tests/021-regression.in                   |   2 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   2 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   2 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   2 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   2 -
 .../tests/025-regression.out                  |   1 -
 .../tests/cases.json                          |  75 ++------
 .../exercise/E-02-14-farmer-cow-bfs/README.md |   2 +-
 .../tests/021-regression.in                   |   1 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   1 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   1 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   1 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   1 -
 .../tests/025-regression.out                  |   1 -
 .../E-02-14-farmer-cow-bfs/tests/cases.json   |  75 ++------
 .../exercise/E-02-15-josephus-order/README.md |   2 +-
 .../tests/021-regression.in                   |   1 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   1 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   1 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   1 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   1 -
 .../tests/025-regression.out                  |   1 -
 .../E-02-15-josephus-order/tests/cases.json   |  75 ++------
 .../E-02-16-binary-number-queue/README.md     |   2 +-
 .../tests/021-regression.in                   |   1 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   1 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   1 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   1 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   1 -
 .../tests/025-regression.out                  |   1 -
 .../tests/cases.json                          |  75 ++------
 .../E-02-17-palindrome-deque/README.md        |   2 +-
 .../tests/021-regression.in                   |   1 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   1 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   1 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   1 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   1 -
 .../tests/025-regression.out                  |   1 -
 .../E-02-17-palindrome-deque/tests/cases.json |  75 ++------
 .../E-02-18-reverse-first-k-queue/README.md   |   2 +-
 .../tests/021-regression.in                   |   2 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   2 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   2 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   2 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   2 -
 .../tests/025-regression.out                  |   1 -
 .../tests/cases.json                          |  75 ++------
 .../exercise/E-02-19-stack-sorting/README.md  |   2 +-
 .../tests/021-regression.in                   |   2 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   2 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   2 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   2 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   2 -
 .../tests/025-regression.out                  |   1 -
 .../E-02-19-stack-sorting/tests/cases.json    |  75 ++------
 .../exercise/E-02-20-stock-span/README.md     |   2 +-
 .../tests/021-regression.in                   |   2 -
 .../tests/021-regression.out                  |   1 -
 .../tests/022-regression.in                   |   2 -
 .../tests/022-regression.out                  |   1 -
 .../tests/023-regression.in                   |   2 -
 .../tests/023-regression.out                  |   1 -
 .../tests/024-regression.in                   |   2 -
 .../tests/024-regression.out                  |   1 -
 .../tests/025-regression.in                   |   2 -
 .../tests/025-regression.out                  |   1 -
 .../E-02-20-stock-span/tests/cases.json       |  75 ++------
 232 files changed, 1254 insertions(+), 1684 deletions(-)
 delete mode 100644 labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/021-blockwise-valid.in
 delete mode 100644 labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/021-blockwise-valid.out
 delete mode 100644 labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/022-invalid-late-top.in
 delete mode 100644 labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/022-invalid-late-top.out
 delete mode 100644 labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/023-negative-valid.in
 delete mode 100644 labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/023-negative-valid.out
 delete mode 100644 labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/024-three-blocks.in
 delete mode 100644 labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/024-three-blocks.out
 delete mode 100644 labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/025-invalid-final-block.in
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diff --git a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/021-blockwise-valid.in b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/021-blockwise-valid.in
deleted file mode 100644
index 6090cef5..00000000
--- a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/021-blockwise-valid.in
+++ /dev/null
@@ -1,3 +0,0 @@
-7
-1 2 3 4 5 6 7
-3 2 1 5 4 7 6
diff --git a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/021-blockwise-valid.out b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/021-blockwise-valid.out
deleted file mode 100644
index f033a501..00000000
--- a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/021-blockwise-valid.out
+++ /dev/null
@@ -1 +0,0 @@
-YES
diff --git a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/022-invalid-late-top.in b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/022-invalid-late-top.in
deleted file mode 100644
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--- a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/022-invalid-late-top.in
+++ /dev/null
@@ -1,3 +0,0 @@
-5
-1 2 3 4 5
-1 2 5 3 4
diff --git a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/022-invalid-late-top.out b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/022-invalid-late-top.out
deleted file mode 100644
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--- a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/022-invalid-late-top.out
+++ /dev/null
@@ -1 +0,0 @@
-NO 3
diff --git a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/023-negative-valid.in b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/023-negative-valid.in
deleted file mode 100644
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--- a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/023-negative-valid.in
+++ /dev/null
@@ -1,3 +0,0 @@
-3
-0 -1 -2
--1 0 -2
diff --git a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/023-negative-valid.out b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/023-negative-valid.out
deleted file mode 100644
index f033a501..00000000
--- a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/023-negative-valid.out
+++ /dev/null
@@ -1 +0,0 @@
-YES
diff --git a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/024-three-blocks.in b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/024-three-blocks.in
deleted file mode 100644
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--- a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/024-three-blocks.in
+++ /dev/null
@@ -1,3 +0,0 @@
-9
-1 2 3 4 5 6 7 8 9
-3 2 1 6 5 4 9 8 7
diff --git a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/024-three-blocks.out b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/024-three-blocks.out
deleted file mode 100644
index f033a501..00000000
--- a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/024-three-blocks.out
+++ /dev/null
@@ -1 +0,0 @@
-YES
diff --git a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/025-invalid-final-block.in b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/025-invalid-final-block.in
deleted file mode 100644
index 0ec1d5c3..00000000
--- a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/025-invalid-final-block.in
+++ /dev/null
@@ -1,3 +0,0 @@
-8
-1 2 3 4 5 6 7 8
-2 1 5 4 8 3 7 6
diff --git a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/025-invalid-final-block.out b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/025-invalid-final-block.out
deleted file mode 100644
index 605e2317..00000000
--- a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/025-invalid-final-block.out
+++ /dev/null
@@ -1 +0,0 @@
-NO 5
diff --git a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/cases.json b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/cases.json
index f59e5d5a..a899ccc0 100644
--- a/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-01-validate-stack-sequences/tests/cases.json
@@ -3,7 +3,7 @@
     "id": "001-valid-sample",
     "input": "tests/001-valid-sample.in",
     "expected": "tests/001-valid-sample.out",
-    "points": 10,
+    "points": 8,
     "tags": [
       "sample"
     ],
@@ -15,7 +15,7 @@
     "id": "002-invalid-middle",
     "input": "tests/002-invalid-middle.in",
     "expected": "tests/002-invalid-middle.out",
-    "points": 20,
+    "points": 8,
     "tags": [
       "normal"
     ]
@@ -24,7 +24,7 @@
     "id": "003-invalid-after-first",
     "input": "tests/003-invalid-after-first.in",
     "expected": "tests/003-invalid-after-first.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "regression"
     ]
@@ -33,7 +33,7 @@
     "id": "004-single",
     "input": "tests/004-single.in",
     "expected": "tests/004-single.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "boundary"
     ]
@@ -42,7 +42,7 @@
     "id": "005-empty",
     "input": "tests/005-empty.in",
     "expected": "tests/005-empty.out",
-    "points": 10,
+    "points": 8,
     "tags": [
       "boundary"
     ]
@@ -51,7 +51,7 @@
     "id": "006-all-delayed",
     "input": "tests/006-all-delayed.in",
     "expected": "tests/006-all-delayed.out",
-    "points": 10,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -60,28 +60,127 @@
     "id": "007-scale",
     "input": "tests/007-scale.in",
     "expected": "tests/007-scale.out",
-    "points": 2,
+    "points": 4,
     "tags": [
       "scale",
       "complexity"
     ]
   },
-  {"id":"008-interleaved-valid","input":"tests/008-interleaved-valid.in","expected":"tests/008-interleaved-valid.out","points":1,"tags":["normal"]},
-  {"id":"009-invalid-late","input":"tests/009-invalid-late.in","expected":"tests/009-invalid-late.out","points":1,"tags":["regression"]},
-  {"id":"010-immediate-valid","input":"tests/010-immediate-valid.in","expected":"tests/010-immediate-valid.out","points":1,"tags":["normal"]},
-  {"id":"011-negative-reverse","input":"tests/011-negative-reverse.in","expected":"tests/011-negative-reverse.out","points":1,"tags":["normal"]},
-  {"id":"012-small-invalid","input":"tests/012-small-invalid.in","expected":"tests/012-small-invalid.out","points":1,"tags":["boundary"]},
-  {"id":"013-delayed-valid","input":"tests/013-delayed-valid.in","expected":"tests/013-delayed-valid.out","points":1,"tags":["normal"]},
-  {"id":"014-int64-values","input":"tests/014-int64-values.in","expected":"tests/014-int64-values.out","points":1,"tags":["boundary"]},
-  {"id":"015-alternating-valid","input":"tests/015-alternating-valid.in","expected":"tests/015-alternating-valid.out","points":1,"tags":["normal"]},
-  {"id":"016-two-valid-blocks","input":"tests/016-two-valid-blocks.in","expected":"tests/016-two-valid-blocks.out","points":1,"tags":["normal"]},
-  {"id":"017-invalid-after-prefix","input":"tests/017-invalid-after-prefix.in","expected":"tests/017-invalid-after-prefix.out","points":1,"tags":["regression"]},
-  {"id":"018-alternating-valid","input":"tests/018-alternating-valid.in","expected":"tests/018-alternating-valid.out","points":1,"tags":["normal"]},
-  {"id":"019-extreme-values","input":"tests/019-extreme-values.in","expected":"tests/019-extreme-values.out","points":1,"tags":["boundary"]},
-  {"id":"020-invalid-stack-top","input":"tests/020-invalid-stack-top.in","expected":"tests/020-invalid-stack-top.out","points":1,"tags":["regression"]},
-  {"id":"021-blockwise-valid","input":"tests/021-blockwise-valid.in","expected":"tests/021-blockwise-valid.out","points":1,"tags":["normal"]},
-  {"id":"022-invalid-late-top","input":"tests/022-invalid-late-top.in","expected":"tests/022-invalid-late-top.out","points":1,"tags":["regression"]},
-  {"id":"023-negative-valid","input":"tests/023-negative-valid.in","expected":"tests/023-negative-valid.out","points":1,"tags":["normal"]},
-  {"id":"024-three-blocks","input":"tests/024-three-blocks.in","expected":"tests/024-three-blocks.out","points":1,"tags":["normal"]},
-  {"id":"025-invalid-final-block","input":"tests/025-invalid-final-block.in","expected":"tests/025-invalid-final-block.out","points":1,"tags":["regression"]}
+  {
+    "id": "008-interleaved-valid",
+    "input": "tests/008-interleaved-valid.in",
+    "expected": "tests/008-interleaved-valid.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-invalid-late",
+    "input": "tests/009-invalid-late.in",
+    "expected": "tests/009-invalid-late.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "010-immediate-valid",
+    "input": "tests/010-immediate-valid.in",
+    "expected": "tests/010-immediate-valid.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-negative-reverse",
+    "input": "tests/011-negative-reverse.in",
+    "expected": "tests/011-negative-reverse.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-small-invalid",
+    "input": "tests/012-small-invalid.in",
+    "expected": "tests/012-small-invalid.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "013-delayed-valid",
+    "input": "tests/013-delayed-valid.in",
+    "expected": "tests/013-delayed-valid.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-int64-values",
+    "input": "tests/014-int64-values.in",
+    "expected": "tests/014-int64-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "015-alternating-valid",
+    "input": "tests/015-alternating-valid.in",
+    "expected": "tests/015-alternating-valid.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-two-valid-blocks",
+    "input": "tests/016-two-valid-blocks.in",
+    "expected": "tests/016-two-valid-blocks.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "017-invalid-after-prefix",
+    "input": "tests/017-invalid-after-prefix.in",
+    "expected": "tests/017-invalid-after-prefix.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-alternating-valid",
+    "input": "tests/018-alternating-valid.in",
+    "expected": "tests/018-alternating-valid.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "019-extreme-values",
+    "input": "tests/019-extreme-values.in",
+    "expected": "tests/019-extreme-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "020-invalid-stack-top",
+    "input": "tests/020-invalid-stack-top.in",
+    "expected": "tests/020-invalid-stack-top.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  }
 ]
diff --git a/labs/chapter-02/exercise/E-02-02-min-stack/tests/021-duplicate-churn.in b/labs/chapter-02/exercise/E-02-02-min-stack/tests/021-duplicate-churn.in
deleted file mode 100644
index 2fb6e63e..00000000
--- a/labs/chapter-02/exercise/E-02-02-min-stack/tests/021-duplicate-churn.in
+++ /dev/null
@@ -1,17 +0,0 @@
-16
-PUSH 4
-PUSH 4
-PUSH 2
-PUSH 2
-MIN
-POP
-MIN
-POP
-MIN
-PUSH 1
-MIN
-POP
-MIN
-POP
-POP
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-02-min-stack/tests/021-duplicate-churn.out b/labs/chapter-02/exercise/E-02-02-min-stack/tests/021-duplicate-churn.out
deleted file mode 100644
index 1a5da05e..00000000
--- a/labs/chapter-02/exercise/E-02-02-min-stack/tests/021-duplicate-churn.out
+++ /dev/null
@@ -1,11 +0,0 @@
-2
-2
-2
-2
-4
-1
-1
-4
-4
-4
-YES
diff --git a/labs/chapter-02/exercise/E-02-02-min-stack/tests/022-transfer-like-sequence.in b/labs/chapter-02/exercise/E-02-02-min-stack/tests/022-transfer-like-sequence.in
deleted file mode 100644
index 6f60bead..00000000
--- a/labs/chapter-02/exercise/E-02-02-min-stack/tests/022-transfer-like-sequence.in
+++ /dev/null
@@ -1,19 +0,0 @@
-18
-PUSH 10
-PUSH 20
-MIN
-POP
-PUSH 5
-PUSH 6
-TOP
-MIN
-POP
-MIN
-POP
-MIN
-SIZE
-EMPTY
-POP
-TOP
-SIZE
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-02-min-stack/tests/022-transfer-like-sequence.out b/labs/chapter-02/exercise/E-02-02-min-stack/tests/022-transfer-like-sequence.out
deleted file mode 100644
index db8e676b..00000000
--- a/labs/chapter-02/exercise/E-02-02-min-stack/tests/022-transfer-like-sequence.out
+++ /dev/null
@@ -1,14 +0,0 @@
-10
-20
-6
-5
-6
-5
-5
-10
-1
-NO
-10
-EMPTY
-0
-YES
diff --git a/labs/chapter-02/exercise/E-02-02-min-stack/tests/023-size-after-failures.in b/labs/chapter-02/exercise/E-02-02-min-stack/tests/023-size-after-failures.in
deleted file mode 100644
index d4569bd1..00000000
--- a/labs/chapter-02/exercise/E-02-02-min-stack/tests/023-size-after-failures.in
+++ /dev/null
@@ -1,13 +0,0 @@
-12
-POP
-TOP
-MIN
-SIZE
-EMPTY
-PUSH 11
-SIZE
-POP
-SIZE
-POP
-EMPTY
-MIN
diff --git a/labs/chapter-02/exercise/E-02-02-min-stack/tests/023-size-after-failures.out b/labs/chapter-02/exercise/E-02-02-min-stack/tests/023-size-after-failures.out
deleted file mode 100644
index ec5d1e92..00000000
--- a/labs/chapter-02/exercise/E-02-02-min-stack/tests/023-size-after-failures.out
+++ /dev/null
@@ -1,11 +0,0 @@
-EMPTY
-EMPTY
-EMPTY
-0
-YES
-1
-11
-0
-EMPTY
-YES
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-02-min-stack/tests/024-large-positive.in b/labs/chapter-02/exercise/E-02-02-min-stack/tests/024-large-positive.in
deleted file mode 100644
index b4700a82..00000000
--- a/labs/chapter-02/exercise/E-02-02-min-stack/tests/024-large-positive.in
+++ /dev/null
@@ -1,12 +0,0 @@
-11
-PUSH 1000000000000
-PUSH 999999999999
-MIN
-PUSH 1000000000001
-TOP
-POP
-MIN
-POP
-MIN
-SIZE
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-02-min-stack/tests/024-large-positive.out b/labs/chapter-02/exercise/E-02-02-min-stack/tests/024-large-positive.out
deleted file mode 100644
index 0dec0796..00000000
--- a/labs/chapter-02/exercise/E-02-02-min-stack/tests/024-large-positive.out
+++ /dev/null
@@ -1,8 +0,0 @@
-999999999999
-1000000000001
-1000000000001
-999999999999
-999999999999
-1000000000000
-1
-NO
diff --git a/labs/chapter-02/exercise/E-02-02-min-stack/tests/025-long-minimum-chain.in b/labs/chapter-02/exercise/E-02-02-min-stack/tests/025-long-minimum-chain.in
deleted file mode 100644
index 3c688b7b..00000000
--- a/labs/chapter-02/exercise/E-02-02-min-stack/tests/025-long-minimum-chain.in
+++ /dev/null
@@ -1,21 +0,0 @@
-20
-PUSH 9
-PUSH 7
-PUSH 5
-PUSH 3
-PUSH 1
-MIN
-POP
-MIN
-POP
-MIN
-POP
-MIN
-POP
-MIN
-POP
-EMPTY
-SIZE
-TOP
-POP
-MIN
diff --git a/labs/chapter-02/exercise/E-02-02-min-stack/tests/025-long-minimum-chain.out b/labs/chapter-02/exercise/E-02-02-min-stack/tests/025-long-minimum-chain.out
deleted file mode 100644
index df115dbd..00000000
--- a/labs/chapter-02/exercise/E-02-02-min-stack/tests/025-long-minimum-chain.out
+++ /dev/null
@@ -1,15 +0,0 @@
-1
-1
-3
-3
-5
-5
-7
-7
-9
-9
-YES
-0
-EMPTY
-EMPTY
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-02-min-stack/tests/cases.json b/labs/chapter-02/exercise/E-02-02-min-stack/tests/cases.json
index 11df9922..3c168fa3 100644
--- a/labs/chapter-02/exercise/E-02-02-min-stack/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-02-min-stack/tests/cases.json
@@ -3,7 +3,7 @@
     "id": "001-duplicate-minimum",
     "input": "tests/001-duplicate-minimum.in",
     "expected": "tests/001-duplicate-minimum.out",
-    "points": 5,
+    "points": 8,
     "tags": [
       "sample"
     ],
@@ -15,7 +15,7 @@
     "id": "002-empty-contract",
     "input": "tests/002-empty-contract.in",
     "expected": "tests/002-empty-contract.out",
-    "points": 20,
+    "points": 8,
     "tags": [
       "boundary",
       "error"
@@ -25,7 +25,7 @@
     "id": "003-negative-duplicates",
     "input": "tests/003-negative-duplicates.in",
     "expected": "tests/003-negative-duplicates.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "normal"
     ]
@@ -34,7 +34,7 @@
     "id": "004-single",
     "input": "tests/004-single.in",
     "expected": "tests/004-single.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "boundary"
     ]
@@ -43,7 +43,7 @@
     "id": "005-restore-chain",
     "input": "tests/005-restore-chain.in",
     "expected": "tests/005-restore-chain.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "normal"
     ]
@@ -52,7 +52,7 @@
     "id": "006-mixed-values",
     "input": "tests/006-mixed-values.in",
     "expected": "tests/006-mixed-values.out",
-    "points": 10,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -61,28 +61,129 @@
     "id": "007-scale",
     "input": "tests/007-scale.in",
     "expected": "tests/007-scale.out",
-    "points": 2,
+    "points": 4,
     "tags": [
       "scale",
       "complexity"
     ]
   },
-  {"id":"008-descending-restore","input":"tests/008-descending-restore.in","expected":"tests/008-descending-restore.out","points":1,"tags":["normal"]},
-  {"id":"009-read-only-queries","input":"tests/009-read-only-queries.in","expected":"tests/009-read-only-queries.out","points":1,"tags":["regression"]},
-  {"id":"010-empty-interleave","input":"tests/010-empty-interleave.in","expected":"tests/010-empty-interleave.out","points":1,"tags":["boundary","error"]},
-  {"id":"011-int64-values","input":"tests/011-int64-values.in","expected":"tests/011-int64-values.out","points":1,"tags":["boundary"]},
-  {"id":"012-zero-positive","input":"tests/012-zero-positive.in","expected":"tests/012-zero-positive.out","points":1,"tags":["normal"]},
-  {"id":"013-minimum-churn","input":"tests/013-minimum-churn.in","expected":"tests/013-minimum-churn.out","points":1,"tags":["regression"]},
-  {"id":"014-size-tracking","input":"tests/014-size-tracking.in","expected":"tests/014-size-tracking.out","points":1,"tags":["normal"]},
-  {"id":"015-single-cycle","input":"tests/015-single-cycle.in","expected":"tests/015-single-cycle.out","points":1,"tags":["boundary"]},
-  {"id":"016-pop-and-min","input":"tests/016-pop-and-min.in","expected":"tests/016-pop-and-min.out","points":1,"tags":["normal"]},
-  {"id":"017-extreme-values","input":"tests/017-extreme-values.in","expected":"tests/017-extreme-values.out","points":1,"tags":["boundary"]},
-  {"id":"018-minimum-restoration","input":"tests/018-minimum-restoration.in","expected":"tests/018-minimum-restoration.out","points":1,"tags":["regression"]},
-  {"id":"019-zero-cycle","input":"tests/019-zero-cycle.in","expected":"tests/019-zero-cycle.out","points":1,"tags":["boundary"]},
-  {"id":"020-empty-and-negative","input":"tests/020-empty-and-negative.in","expected":"tests/020-empty-and-negative.out","points":1,"tags":["boundary","error"]},
-  {"id":"021-duplicate-churn","input":"tests/021-duplicate-churn.in","expected":"tests/021-duplicate-churn.out","points":1,"tags":["regression"]},
-  {"id":"022-transfer-like-sequence","input":"tests/022-transfer-like-sequence.in","expected":"tests/022-transfer-like-sequence.out","points":1,"tags":["normal"]},
-  {"id":"023-size-after-failures","input":"tests/023-size-after-failures.in","expected":"tests/023-size-after-failures.out","points":1,"tags":["error"]},
-  {"id":"024-large-positive","input":"tests/024-large-positive.in","expected":"tests/024-large-positive.out","points":1,"tags":["boundary"]},
-  {"id":"025-long-minimum-chain","input":"tests/025-long-minimum-chain.in","expected":"tests/025-long-minimum-chain.out","points":1,"tags":["normal"]}
+  {
+    "id": "008-descending-restore",
+    "input": "tests/008-descending-restore.in",
+    "expected": "tests/008-descending-restore.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-read-only-queries",
+    "input": "tests/009-read-only-queries.in",
+    "expected": "tests/009-read-only-queries.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "010-empty-interleave",
+    "input": "tests/010-empty-interleave.in",
+    "expected": "tests/010-empty-interleave.out",
+    "points": 4,
+    "tags": [
+      "boundary",
+      "error"
+    ]
+  },
+  {
+    "id": "011-int64-values",
+    "input": "tests/011-int64-values.in",
+    "expected": "tests/011-int64-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "012-zero-positive",
+    "input": "tests/012-zero-positive.in",
+    "expected": "tests/012-zero-positive.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-minimum-churn",
+    "input": "tests/013-minimum-churn.in",
+    "expected": "tests/013-minimum-churn.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "014-size-tracking",
+    "input": "tests/014-size-tracking.in",
+    "expected": "tests/014-size-tracking.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-single-cycle",
+    "input": "tests/015-single-cycle.in",
+    "expected": "tests/015-single-cycle.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "016-pop-and-min",
+    "input": "tests/016-pop-and-min.in",
+    "expected": "tests/016-pop-and-min.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "017-extreme-values",
+    "input": "tests/017-extreme-values.in",
+    "expected": "tests/017-extreme-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "018-minimum-restoration",
+    "input": "tests/018-minimum-restoration.in",
+    "expected": "tests/018-minimum-restoration.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-zero-cycle",
+    "input": "tests/019-zero-cycle.in",
+    "expected": "tests/019-zero-cycle.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "020-empty-and-negative",
+    "input": "tests/020-empty-and-negative.in",
+    "expected": "tests/020-empty-and-negative.out",
+    "points": 4,
+    "tags": [
+      "boundary",
+      "error"
+    ]
+  }
 ]
diff --git a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/021-regular-spacing.in b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/021-regular-spacing.in
deleted file mode 100644
index e666ebf2..00000000
--- a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/021-regular-spacing.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7
-7 1007 2007 3007 4007 5007 6007
diff --git a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/021-regular-spacing.out b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/021-regular-spacing.out
deleted file mode 100644
index c9c9d53b..00000000
--- a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/021-regular-spacing.out
+++ /dev/null
@@ -1 +0,0 @@
-1 2 3 4 4 4 4
diff --git a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/022-long-gap.in b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/022-long-gap.in
deleted file mode 100644
index 0fd3c4e8..00000000
--- a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/022-long-gap.in
+++ /dev/null
@@ -1,2 +0,0 @@
-6
-1 2 10000 10001 13000 13001
diff --git a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/022-long-gap.out b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/022-long-gap.out
deleted file mode 100644
index e66def97..00000000
--- a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/022-long-gap.out
+++ /dev/null
@@ -1 +0,0 @@
-1 2 1 2 3 3
diff --git a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/023-large-timestamps.in b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/023-large-timestamps.in
deleted file mode 100644
index b4ba44ab..00000000
--- a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/023-large-timestamps.in
+++ /dev/null
@@ -1,2 +0,0 @@
-3
-123456789012345 123456789015345 123456789015346
diff --git a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/023-large-timestamps.out b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/023-large-timestamps.out
deleted file mode 100644
index 43cebf1d..00000000
--- a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/023-large-timestamps.out
+++ /dev/null
@@ -1 +0,0 @@
-1 2 2
diff --git a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/024-boundary-reentry.in b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/024-boundary-reentry.in
deleted file mode 100644
index 4ba36b74..00000000
--- a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/024-boundary-reentry.in
+++ /dev/null
@@ -1,2 +0,0 @@
-6
-500 3500 3501 6500 6501 9501
diff --git a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/024-boundary-reentry.out b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/024-boundary-reentry.out
deleted file mode 100644
index cc37ad67..00000000
--- a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/024-boundary-reentry.out
+++ /dev/null
@@ -1 +0,0 @@
-1 2 2 3 3 2
diff --git a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/025-stepped-expiry.in b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/025-stepped-expiry.in
deleted file mode 100644
index 68661de4..00000000
--- a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/025-stepped-expiry.in
+++ /dev/null
@@ -1,2 +0,0 @@
-5
-0 2999 5998 8997 11996
diff --git a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/025-stepped-expiry.out b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/025-stepped-expiry.out
deleted file mode 100644
index 1af3cd67..00000000
--- a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/025-stepped-expiry.out
+++ /dev/null
@@ -1 +0,0 @@
-1 2 2 2 2
diff --git a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/cases.json b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/cases.json
index 2f697374..80d3f3b0 100644
--- a/labs/chapter-02/exercise/E-02-03-recent-counter/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-03-recent-counter/tests/cases.json
@@ -3,7 +3,7 @@
     "id": "001-sample",
     "input": "tests/001-sample.in",
     "expected": "tests/001-sample.out",
-    "points": 5,
+    "points": 8,
     "tags": [
       "sample"
     ],
@@ -15,7 +15,7 @@
     "id": "002-inclusive-boundary",
     "input": "tests/002-inclusive-boundary.in",
     "expected": "tests/002-inclusive-boundary.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "boundary"
     ]
@@ -24,7 +24,7 @@
     "id": "003-sparse",
     "input": "tests/003-sparse.in",
     "expected": "tests/003-sparse.out",
-    "points": 20,
+    "points": 8,
     "tags": [
       "normal"
     ]
@@ -33,7 +33,7 @@
     "id": "004-dense",
     "input": "tests/004-dense.in",
     "expected": "tests/004-dense.out",
-    "points": 20,
+    "points": 8,
     "tags": [
       "normal"
     ]
@@ -42,7 +42,7 @@
     "id": "005-large-time",
     "input": "tests/005-large-time.in",
     "expected": "tests/005-large-time.out",
-    "points": 20,
+    "points": 8,
     "tags": [
       "boundary"
     ]
@@ -51,29 +51,137 @@
     "id": "006-scale",
     "input": "tests/006-scale.in",
     "expected": "tests/006-scale.out",
-    "points": 1,
+    "points": 4,
     "tags": [
       "scale",
       "complexity"
     ]
   },
-  {"id":"007-single","input":"tests/007-single.in","expected":"tests/007-single.out","points":1,"tags":["boundary"]},
-  {"id":"008-all-within","input":"tests/008-all-within.in","expected":"tests/008-all-within.out","points":1,"tags":["normal"]},
-  {"id":"009-boundary-repeated","input":"tests/009-boundary-repeated.in","expected":"tests/009-boundary-repeated.out","points":1,"tags":["boundary","regression"]},
-  {"id":"010-large-gaps","input":"tests/010-large-gaps.in","expected":"tests/010-large-gaps.out","points":1,"tags":["normal"]},
-  {"id":"011-burst-and-gap","input":"tests/011-burst-and-gap.in","expected":"tests/011-burst-and-gap.out","points":1,"tags":["normal"]},
-  {"id":"012-near-zero","input":"tests/012-near-zero.in","expected":"tests/012-near-zero.out","points":1,"tags":["boundary"]},
-  {"id":"013-max-timestamp","input":"tests/013-max-timestamp.in","expected":"tests/013-max-timestamp.out","points":1,"tags":["boundary"]},
-  {"id":"014-steady-spacing","input":"tests/014-steady-spacing.in","expected":"tests/014-steady-spacing.out","points":1,"tags":["normal"]},
-  {"id":"015-window-expiry","input":"tests/015-window-expiry.in","expected":"tests/015-window-expiry.out","points":1,"tags":["regression"]},
-  {"id":"016-exact-boundaries","input":"tests/016-exact-boundaries.in","expected":"tests/016-exact-boundaries.out","points":1,"tags":["boundary"]},
-  {"id":"017-two-bursts","input":"tests/017-two-bursts.in","expected":"tests/017-two-bursts.out","points":1,"tags":["normal"]},
-  {"id":"018-near-zero-window","input":"tests/018-near-zero-window.in","expected":"tests/018-near-zero-window.out","points":1,"tags":["boundary"]},
-  {"id":"019-repeated-expiry","input":"tests/019-repeated-expiry.in","expected":"tests/019-repeated-expiry.out","points":1,"tags":["regression"]},
-  {"id":"020-max-time-range","input":"tests/020-max-time-range.in","expected":"tests/020-max-time-range.out","points":1,"tags":["boundary"]},
-  {"id":"021-regular-spacing","input":"tests/021-regular-spacing.in","expected":"tests/021-regular-spacing.out","points":1,"tags":["normal"]},
-  {"id":"022-long-gap","input":"tests/022-long-gap.in","expected":"tests/022-long-gap.out","points":1,"tags":["normal"]},
-  {"id":"023-large-timestamps","input":"tests/023-large-timestamps.in","expected":"tests/023-large-timestamps.out","points":1,"tags":["boundary"]},
-  {"id":"024-boundary-reentry","input":"tests/024-boundary-reentry.in","expected":"tests/024-boundary-reentry.out","points":1,"tags":["regression"]},
-  {"id":"025-stepped-expiry","input":"tests/025-stepped-expiry.in","expected":"tests/025-stepped-expiry.out","points":1,"tags":["normal"]}
+  {
+    "id": "007-single",
+    "input": "tests/007-single.in",
+    "expected": "tests/007-single.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "008-all-within",
+    "input": "tests/008-all-within.in",
+    "expected": "tests/008-all-within.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "009-boundary-repeated",
+    "input": "tests/009-boundary-repeated.in",
+    "expected": "tests/009-boundary-repeated.out",
+    "points": 4,
+    "tags": [
+      "boundary",
+      "regression"
+    ]
+  },
+  {
+    "id": "010-large-gaps",
+    "input": "tests/010-large-gaps.in",
+    "expected": "tests/010-large-gaps.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "011-burst-and-gap",
+    "input": "tests/011-burst-and-gap.in",
+    "expected": "tests/011-burst-and-gap.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-near-zero",
+    "input": "tests/012-near-zero.in",
+    "expected": "tests/012-near-zero.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "013-max-timestamp",
+    "input": "tests/013-max-timestamp.in",
+    "expected": "tests/013-max-timestamp.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "014-steady-spacing",
+    "input": "tests/014-steady-spacing.in",
+    "expected": "tests/014-steady-spacing.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-window-expiry",
+    "input": "tests/015-window-expiry.in",
+    "expected": "tests/015-window-expiry.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "016-exact-boundaries",
+    "input": "tests/016-exact-boundaries.in",
+    "expected": "tests/016-exact-boundaries.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "017-two-bursts",
+    "input": "tests/017-two-bursts.in",
+    "expected": "tests/017-two-bursts.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "018-near-zero-window",
+    "input": "tests/018-near-zero-window.in",
+    "expected": "tests/018-near-zero-window.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "019-repeated-expiry",
+    "input": "tests/019-repeated-expiry.in",
+    "expected": "tests/019-repeated-expiry.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-max-time-range",
+    "input": "tests/020-max-time-range.in",
+    "expected": "tests/020-max-time-range.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  }
 ]
diff --git a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/021-failed-enqueues.in b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/021-failed-enqueues.in
deleted file mode 100644
index ac65c86a..00000000
--- a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/021-failed-enqueues.in
+++ /dev/null
@@ -1,17 +0,0 @@
-2
-15
-ENQUEUE 1
-ENQUEUE 2
-ENQUEUE 3
-FULL
-FRONT
-REAR
-SIZE
-DEQUEUE
-ENQUEUE 4
-ENQUEUE 5
-FULL
-REAR
-DEQUEUE
-DEQUEUE
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/021-failed-enqueues.out b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/021-failed-enqueues.out
deleted file mode 100644
index 9d44b90a..00000000
--- a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/021-failed-enqueues.out
+++ /dev/null
@@ -1,15 +0,0 @@
-TRUE
-TRUE
-FALSE
-TRUE
-1
-2
-2
-1
-TRUE
-FALSE
-TRUE
-4
-2
-4
-TRUE
diff --git a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/022-negative-cycle.in b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/022-negative-cycle.in
deleted file mode 100644
index 0d1ec927..00000000
--- a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/022-negative-cycle.in
+++ /dev/null
@@ -1,14 +0,0 @@
-3
-12
-ENQUEUE -1
-ENQUEUE -2
-DEQUEUE
-ENQUEUE -3
-FRONT
-REAR
-DEQUEUE
-DEQUEUE
-ENQUEUE -4
-FRONT
-SIZE
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/022-negative-cycle.out b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/022-negative-cycle.out
deleted file mode 100644
index f2c1c8a9..00000000
--- a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/022-negative-cycle.out
+++ /dev/null
@@ -1,12 +0,0 @@
-TRUE
-TRUE
--1
-TRUE
--2
--3
--2
--3
-TRUE
--4
-1
-FALSE
diff --git a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/023-empty-status.in b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/023-empty-status.in
deleted file mode 100644
index 4cc4c06f..00000000
--- a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/023-empty-status.in
+++ /dev/null
@@ -1,13 +0,0 @@
-1
-11
-EMPTY
-FULL
-FRONT
-REAR
-DEQUEUE
-SIZE
-ENQUEUE 0
-FULL
-DEQUEUE
-EMPTY
-FULL
diff --git a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/023-empty-status.out b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/023-empty-status.out
deleted file mode 100644
index 94baab6b..00000000
--- a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/023-empty-status.out
+++ /dev/null
@@ -1,11 +0,0 @@
-TRUE
-FALSE
-EMPTY
-EMPTY
-EMPTY
-0
-TRUE
-TRUE
-0
-TRUE
-FALSE
diff --git a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/024-reuse-after-wrap.in b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/024-reuse-after-wrap.in
deleted file mode 100644
index 96f277d5..00000000
--- a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/024-reuse-after-wrap.in
+++ /dev/null
@@ -1,14 +0,0 @@
-2
-12
-ENQUEUE 1
-DEQUEUE
-ENQUEUE 2
-DEQUEUE
-ENQUEUE 3
-DEQUEUE
-ENQUEUE 4
-FRONT
-REAR
-SIZE
-DEQUEUE
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/024-reuse-after-wrap.out b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/024-reuse-after-wrap.out
deleted file mode 100644
index 590854c0..00000000
--- a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/024-reuse-after-wrap.out
+++ /dev/null
@@ -1,12 +0,0 @@
-TRUE
-1
-TRUE
-2
-TRUE
-3
-TRUE
-4
-4
-1
-4
-TRUE
diff --git a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/025-large-values.in b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/025-large-values.in
deleted file mode 100644
index 169730dd..00000000
--- a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/025-large-values.in
+++ /dev/null
@@ -1,14 +0,0 @@
-3
-12
-ENQUEUE 1000000000000
-ENQUEUE -1000000000000
-FRONT
-REAR
-DEQUEUE
-ENQUEUE 0
-REAR
-SIZE
-DEQUEUE
-DEQUEUE
-EMPTY
-FULL
diff --git a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/025-large-values.out b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/025-large-values.out
deleted file mode 100644
index 2d79346d..00000000
--- a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/025-large-values.out
+++ /dev/null
@@ -1,12 +0,0 @@
-TRUE
-TRUE
-1000000000000
--1000000000000
-1000000000000
-TRUE
-0
-2
--1000000000000
-0
-TRUE
-FALSE
diff --git a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/cases.json b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/cases.json
index 34c1045c..ed431075 100644
--- a/labs/chapter-02/exercise/E-02-04-circular-queue/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-04-circular-queue/tests/cases.json
@@ -3,7 +3,7 @@
     "id": "001-sample",
     "input": "tests/001-sample.in",
     "expected": "tests/001-sample.out",
-    "points": 10,
+    "points": 8,
     "tags": [
       "sample"
     ],
@@ -15,7 +15,7 @@
     "id": "002-wraparound",
     "input": "tests/002-wraparound.in",
     "expected": "tests/002-wraparound.out",
-    "points": 20,
+    "points": 8,
     "tags": [
       "boundary"
     ]
@@ -24,7 +24,7 @@
     "id": "003-capacity-one",
     "input": "tests/003-capacity-one.in",
     "expected": "tests/003-capacity-one.out",
-    "points": 20,
+    "points": 8,
     "tags": [
       "boundary"
     ]
@@ -33,7 +33,7 @@
     "id": "004-empty-stability",
     "input": "tests/004-empty-stability.in",
     "expected": "tests/004-empty-stability.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "error"
     ]
@@ -42,7 +42,7 @@
     "id": "005-negative-duplicates",
     "input": "tests/005-negative-duplicates.in",
     "expected": "tests/005-negative-duplicates.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "normal"
     ]
@@ -51,30 +51,139 @@
     "id": "006-scale-wraparound",
     "input": "tests/006-scale-wraparound.in",
     "expected": "tests/006-scale-wraparound.out",
-    "points": 1,
+    "points": 4,
     "tags": [
       "scale",
       "complexity",
       "wraparound"
     ]
   },
-  {"id":"007-fill-and-reject","input":"tests/007-fill-and-reject.in","expected":"tests/007-fill-and-reject.out","points":1,"tags":["boundary","error"]},
-  {"id":"008-multi-wrap","input":"tests/008-multi-wrap.in","expected":"tests/008-multi-wrap.out","points":1,"tags":["wraparound","regression"]},
-  {"id":"009-capacity-two","input":"tests/009-capacity-two.in","expected":"tests/009-capacity-two.out","points":1,"tags":["boundary"]},
-  {"id":"010-int64-values","input":"tests/010-int64-values.in","expected":"tests/010-int64-values.out","points":1,"tags":["boundary"]},
-  {"id":"011-empty-repeated","input":"tests/011-empty-repeated.in","expected":"tests/011-empty-repeated.out","points":1,"tags":["error"]},
-  {"id":"012-peek-stability","input":"tests/012-peek-stability.in","expected":"tests/012-peek-stability.out","points":1,"tags":["regression"]},
-  {"id":"013-alternating","input":"tests/013-alternating.in","expected":"tests/013-alternating.out","points":1,"tags":["normal"]},
-  {"id":"014-drain-refill","input":"tests/014-drain-refill.in","expected":"tests/014-drain-refill.out","points":1,"tags":["normal"]},
-  {"id":"015-status-cycle","input":"tests/015-status-cycle.in","expected":"tests/015-status-cycle.out","points":1,"tags":["normal"]},
-  {"id":"016-extreme-values","input":"tests/016-extreme-values.in","expected":"tests/016-extreme-values.out","points":1,"tags":["boundary"]},
-  {"id":"017-double-wrap","input":"tests/017-double-wrap.in","expected":"tests/017-double-wrap.out","points":1,"tags":["regression"]},
-  {"id":"018-repeated-peeks","input":"tests/018-repeated-peeks.in","expected":"tests/018-repeated-peeks.out","points":1,"tags":["normal"]},
-  {"id":"019-capacity-three","input":"tests/019-capacity-three.in","expected":"tests/019-capacity-three.out","points":1,"tags":["boundary"]},
-  {"id":"020-drain-and-fill","input":"tests/020-drain-and-fill.in","expected":"tests/020-drain-and-fill.out","points":1,"tags":["normal"]},
-  {"id":"021-failed-enqueues","input":"tests/021-failed-enqueues.in","expected":"tests/021-failed-enqueues.out","points":1,"tags":["error"]},
-  {"id":"022-negative-cycle","input":"tests/022-negative-cycle.in","expected":"tests/022-negative-cycle.out","points":1,"tags":["normal"]},
-  {"id":"023-empty-status","input":"tests/023-empty-status.in","expected":"tests/023-empty-status.out","points":1,"tags":["boundary"]},
-  {"id":"024-reuse-after-wrap","input":"tests/024-reuse-after-wrap.in","expected":"tests/024-reuse-after-wrap.out","points":1,"tags":["regression"]},
-  {"id":"025-large-values","input":"tests/025-large-values.in","expected":"tests/025-large-values.out","points":1,"tags":["boundary"]}
+  {
+    "id": "007-fill-and-reject",
+    "input": "tests/007-fill-and-reject.in",
+    "expected": "tests/007-fill-and-reject.out",
+    "points": 4,
+    "tags": [
+      "boundary",
+      "error"
+    ]
+  },
+  {
+    "id": "008-multi-wrap",
+    "input": "tests/008-multi-wrap.in",
+    "expected": "tests/008-multi-wrap.out",
+    "points": 4,
+    "tags": [
+      "wraparound",
+      "regression"
+    ]
+  },
+  {
+    "id": "009-capacity-two",
+    "input": "tests/009-capacity-two.in",
+    "expected": "tests/009-capacity-two.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "010-int64-values",
+    "input": "tests/010-int64-values.in",
+    "expected": "tests/010-int64-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "011-empty-repeated",
+    "input": "tests/011-empty-repeated.in",
+    "expected": "tests/011-empty-repeated.out",
+    "points": 4,
+    "tags": [
+      "error"
+    ]
+  },
+  {
+    "id": "012-peek-stability",
+    "input": "tests/012-peek-stability.in",
+    "expected": "tests/012-peek-stability.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "013-alternating",
+    "input": "tests/013-alternating.in",
+    "expected": "tests/013-alternating.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-drain-refill",
+    "input": "tests/014-drain-refill.in",
+    "expected": "tests/014-drain-refill.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-status-cycle",
+    "input": "tests/015-status-cycle.in",
+    "expected": "tests/015-status-cycle.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-extreme-values",
+    "input": "tests/016-extreme-values.in",
+    "expected": "tests/016-extreme-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "017-double-wrap",
+    "input": "tests/017-double-wrap.in",
+    "expected": "tests/017-double-wrap.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-repeated-peeks",
+    "input": "tests/018-repeated-peeks.in",
+    "expected": "tests/018-repeated-peeks.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "019-capacity-three",
+    "input": "tests/019-capacity-three.in",
+    "expected": "tests/019-capacity-three.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "020-drain-and-fill",
+    "input": "tests/020-drain-and-fill.in",
+    "expected": "tests/020-drain-and-fill.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  }
 ]
diff --git a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/021-size-tracking.in b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/021-size-tracking.in
deleted file mode 100644
index 53f7a82f..00000000
--- a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/021-size-tracking.in
+++ /dev/null
@@ -1,13 +0,0 @@
-12
-EMPTY
-SIZE
-ENQUEUE 7
-SIZE
-ENQUEUE 8
-SIZE
-DEQUEUE
-SIZE
-DEQUEUE
-SIZE
-EMPTY
-FRONT
diff --git a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/021-size-tracking.out b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/021-size-tracking.out
deleted file mode 100644
index 5a414517..00000000
--- a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/021-size-tracking.out
+++ /dev/null
@@ -1,10 +0,0 @@
-YES
-0
-1
-2
-7
-1
-8
-0
-YES
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/022-interleaved-transfers.in b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/022-interleaved-transfers.in
deleted file mode 100644
index 85acf200..00000000
--- a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/022-interleaved-transfers.in
+++ /dev/null
@@ -1,14 +0,0 @@
-13
-ENQUEUE 1
-ENQUEUE 2
-DEQUEUE
-ENQUEUE 3
-ENQUEUE 4
-FRONT
-DEQUEUE
-DEQUEUE
-ENQUEUE 5
-FRONT
-DEQUEUE
-DEQUEUE
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/022-interleaved-transfers.out b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/022-interleaved-transfers.out
deleted file mode 100644
index 8cf83a24..00000000
--- a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/022-interleaved-transfers.out
+++ /dev/null
@@ -1,8 +0,0 @@
-1
-2
-2
-3
-4
-4
-5
-YES
diff --git a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/023-singleton-repeated.in b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/023-singleton-repeated.in
deleted file mode 100644
index 74f032a8..00000000
--- a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/023-singleton-repeated.in
+++ /dev/null
@@ -1,10 +0,0 @@
-9
-ENQUEUE 9
-FRONT
-DEQUEUE
-FRONT
-ENQUEUE 10
-SIZE
-DEQUEUE
-EMPTY
-DEQUEUE
diff --git a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/023-singleton-repeated.out b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/023-singleton-repeated.out
deleted file mode 100644
index 5c6bc0b6..00000000
--- a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/023-singleton-repeated.out
+++ /dev/null
@@ -1,7 +0,0 @@
-9
-9
-EMPTY
-1
-10
-YES
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/024-large-values.in b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/024-large-values.in
deleted file mode 100644
index 1e33681b..00000000
--- a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/024-large-values.in
+++ /dev/null
@@ -1,12 +0,0 @@
-11
-ENQUEUE 1000000000000
-ENQUEUE -1000000000000
-FRONT
-DEQUEUE
-FRONT
-DEQUEUE
-EMPTY
-SIZE
-ENQUEUE 0
-DEQUEUE
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/024-large-values.out b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/024-large-values.out
deleted file mode 100644
index aeff9c3c..00000000
--- a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/024-large-values.out
+++ /dev/null
@@ -1,8 +0,0 @@
-1000000000000
-1000000000000
--1000000000000
--1000000000000
-YES
-0
-0
-YES
diff --git a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/025-front-stability.in b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/025-front-stability.in
deleted file mode 100644
index 57138716..00000000
--- a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/025-front-stability.in
+++ /dev/null
@@ -1,12 +0,0 @@
-11
-ENQUEUE 4
-ENQUEUE 5
-FRONT
-FRONT
-DEQUEUE
-FRONT
-DEQUEUE
-FRONT
-EMPTY
-SIZE
-DEQUEUE
diff --git a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/025-front-stability.out b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/025-front-stability.out
deleted file mode 100644
index ff160232..00000000
--- a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/025-front-stability.out
+++ /dev/null
@@ -1,9 +0,0 @@
-4
-4
-4
-5
-5
-EMPTY
-YES
-0
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/cases.json b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/cases.json
index 47bab216..6038f522 100644
--- a/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-05-queue-using-stacks/tests/cases.json
@@ -3,7 +3,7 @@
     "id": "001-lazy-transfer",
     "input": "tests/001-lazy-transfer.in",
     "expected": "tests/001-lazy-transfer.out",
-    "points": 10,
+    "points": 8,
     "tags": [
       "sample"
     ],
@@ -15,7 +15,7 @@
     "id": "002-empty",
     "input": "tests/002-empty.in",
     "expected": "tests/002-empty.out",
-    "points": 20,
+    "points": 8,
     "tags": [
       "boundary",
       "error"
@@ -25,7 +25,7 @@
     "id": "003-multiple-transfers",
     "input": "tests/003-multiple-transfers.in",
     "expected": "tests/003-multiple-transfers.out",
-    "points": 20,
+    "points": 8,
     "tags": [
       "regression"
     ]
@@ -34,7 +34,7 @@
     "id": "004-duplicates",
     "input": "tests/004-duplicates.in",
     "expected": "tests/004-duplicates.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "normal"
     ]
@@ -43,7 +43,7 @@
     "id": "005-alternating",
     "input": "tests/005-alternating.in",
     "expected": "tests/005-alternating.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "normal"
     ]
@@ -52,30 +52,139 @@
     "id": "006-scale-transfer",
     "input": "tests/006-scale-transfer.in",
     "expected": "tests/006-scale-transfer.out",
-    "points": 1,
+    "points": 4,
     "tags": [
       "scale",
       "complexity",
       "amortized"
     ]
   },
-  {"id":"007-single","input":"tests/007-single.in","expected":"tests/007-single.out","points":1,"tags":["boundary"]},
-  {"id":"008-front-repeat","input":"tests/008-front-repeat.in","expected":"tests/008-front-repeat.out","points":1,"tags":["regression"]},
-  {"id":"009-drain-refill","input":"tests/009-drain-refill.in","expected":"tests/009-drain-refill.out","points":1,"tags":["normal"]},
-  {"id":"010-empty-interleave","input":"tests/010-empty-interleave.in","expected":"tests/010-empty-interleave.out","points":1,"tags":["boundary","error"]},
-  {"id":"011-negative-values","input":"tests/011-negative-values.in","expected":"tests/011-negative-values.out","points":1,"tags":["normal"]},
-  {"id":"012-transfer-chain","input":"tests/012-transfer-chain.in","expected":"tests/012-transfer-chain.out","points":1,"tags":["regression"]},
-  {"id":"013-size-empty","input":"tests/013-size-empty.in","expected":"tests/013-size-empty.out","points":1,"tags":["normal"]},
-  {"id":"014-int64-values","input":"tests/014-int64-values.in","expected":"tests/014-int64-values.out","points":1,"tags":["boundary"]},
-  {"id":"015-alternating","input":"tests/015-alternating.in","expected":"tests/015-alternating.out","points":1,"tags":["normal"]},
-  {"id":"016-extreme-values","input":"tests/016-extreme-values.in","expected":"tests/016-extreme-values.out","points":1,"tags":["boundary"]},
-  {"id":"017-front-before-transfer","input":"tests/017-front-before-transfer.in","expected":"tests/017-front-before-transfer.out","points":1,"tags":["normal"]},
-  {"id":"018-multiple-drains","input":"tests/018-multiple-drains.in","expected":"tests/018-multiple-drains.out","points":1,"tags":["regression"]},
-  {"id":"019-negative-cycle","input":"tests/019-negative-cycle.in","expected":"tests/019-negative-cycle.out","points":1,"tags":["normal"]},
-  {"id":"020-empty-recovery","input":"tests/020-empty-recovery.in","expected":"tests/020-empty-recovery.out","points":1,"tags":["boundary","error"]},
-  {"id":"021-size-tracking","input":"tests/021-size-tracking.in","expected":"tests/021-size-tracking.out","points":1,"tags":["normal"]},
-  {"id":"022-interleaved-transfers","input":"tests/022-interleaved-transfers.in","expected":"tests/022-interleaved-transfers.out","points":1,"tags":["regression"]},
-  {"id":"023-singleton-repeated","input":"tests/023-singleton-repeated.in","expected":"tests/023-singleton-repeated.out","points":1,"tags":["boundary"]},
-  {"id":"024-large-values","input":"tests/024-large-values.in","expected":"tests/024-large-values.out","points":1,"tags":["boundary"]},
-  {"id":"025-front-stability","input":"tests/025-front-stability.in","expected":"tests/025-front-stability.out","points":1,"tags":["regression"]}
+  {
+    "id": "007-single",
+    "input": "tests/007-single.in",
+    "expected": "tests/007-single.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "008-front-repeat",
+    "input": "tests/008-front-repeat.in",
+    "expected": "tests/008-front-repeat.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "009-drain-refill",
+    "input": "tests/009-drain-refill.in",
+    "expected": "tests/009-drain-refill.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-empty-interleave",
+    "input": "tests/010-empty-interleave.in",
+    "expected": "tests/010-empty-interleave.out",
+    "points": 4,
+    "tags": [
+      "boundary",
+      "error"
+    ]
+  },
+  {
+    "id": "011-negative-values",
+    "input": "tests/011-negative-values.in",
+    "expected": "tests/011-negative-values.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "012-transfer-chain",
+    "input": "tests/012-transfer-chain.in",
+    "expected": "tests/012-transfer-chain.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "013-size-empty",
+    "input": "tests/013-size-empty.in",
+    "expected": "tests/013-size-empty.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "014-int64-values",
+    "input": "tests/014-int64-values.in",
+    "expected": "tests/014-int64-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "015-alternating",
+    "input": "tests/015-alternating.in",
+    "expected": "tests/015-alternating.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-extreme-values",
+    "input": "tests/016-extreme-values.in",
+    "expected": "tests/016-extreme-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "017-front-before-transfer",
+    "input": "tests/017-front-before-transfer.in",
+    "expected": "tests/017-front-before-transfer.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "018-multiple-drains",
+    "input": "tests/018-multiple-drains.in",
+    "expected": "tests/018-multiple-drains.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "019-negative-cycle",
+    "input": "tests/019-negative-cycle.in",
+    "expected": "tests/019-negative-cycle.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "020-empty-recovery",
+    "input": "tests/020-empty-recovery.in",
+    "expected": "tests/020-empty-recovery.out",
+    "points": 4,
+    "tags": [
+      "boundary",
+      "error"
+    ]
+  }
 ]
diff --git a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/021-failed-inserts.in b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/021-failed-inserts.in
deleted file mode 100644
index 59fcfaba..00000000
--- a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/021-failed-inserts.in
+++ /dev/null
@@ -1,17 +0,0 @@
-2
-15
-INSERT_LAST 1
-INSERT_LAST 2
-INSERT_FRONT 3
-FULL
-FRONT
-REAR
-SIZE
-DELETE_FRONT
-INSERT_FRONT 4
-INSERT_LAST 5
-FULL
-REAR
-DELETE_LAST
-DELETE_FRONT
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/021-failed-inserts.out b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/021-failed-inserts.out
deleted file mode 100644
index 8b3a7905..00000000
--- a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/021-failed-inserts.out
+++ /dev/null
@@ -1,15 +0,0 @@
-TRUE
-TRUE
-FALSE
-TRUE
-1
-2
-2
-1
-TRUE
-FALSE
-TRUE
-2
-2
-4
-TRUE
diff --git a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/022-negative-cycle.in b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/022-negative-cycle.in
deleted file mode 100644
index eaad5d16..00000000
--- a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/022-negative-cycle.in
+++ /dev/null
@@ -1,14 +0,0 @@
-3
-12
-INSERT_LAST -1
-INSERT_FRONT -2
-DELETE_LAST
-INSERT_LAST -3
-FRONT
-REAR
-DELETE_FRONT
-DELETE_LAST
-INSERT_FRONT -4
-FRONT
-SIZE
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/022-negative-cycle.out b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/022-negative-cycle.out
deleted file mode 100644
index f2c1c8a9..00000000
--- a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/022-negative-cycle.out
+++ /dev/null
@@ -1,12 +0,0 @@
-TRUE
-TRUE
--1
-TRUE
--2
--3
--2
--3
-TRUE
--4
-1
-FALSE
diff --git a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/023-empty-status.in b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/023-empty-status.in
deleted file mode 100644
index b6a443b6..00000000
--- a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/023-empty-status.in
+++ /dev/null
@@ -1,14 +0,0 @@
-1
-12
-EMPTY
-FULL
-FRONT
-REAR
-DELETE_FRONT
-DELETE_LAST
-SIZE
-INSERT_LAST 0
-FULL
-DELETE_LAST
-EMPTY
-FULL
diff --git a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/023-empty-status.out b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/023-empty-status.out
deleted file mode 100644
index 90fb9f83..00000000
--- a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/023-empty-status.out
+++ /dev/null
@@ -1,12 +0,0 @@
-TRUE
-FALSE
-EMPTY
-EMPTY
-EMPTY
-EMPTY
-0
-TRUE
-TRUE
-0
-TRUE
-FALSE
diff --git a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/024-reuse-after-wrap.in b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/024-reuse-after-wrap.in
deleted file mode 100644
index 9b1774a8..00000000
--- a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/024-reuse-after-wrap.in
+++ /dev/null
@@ -1,14 +0,0 @@
-2
-12
-INSERT_LAST 1
-DELETE_FRONT
-INSERT_FRONT 2
-DELETE_LAST
-INSERT_LAST 3
-DELETE_FRONT
-INSERT_FRONT 4
-FRONT
-REAR
-SIZE
-DELETE_LAST
-EMPTY
diff --git a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/024-reuse-after-wrap.out b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/024-reuse-after-wrap.out
deleted file mode 100644
index 590854c0..00000000
--- a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/024-reuse-after-wrap.out
+++ /dev/null
@@ -1,12 +0,0 @@
-TRUE
-1
-TRUE
-2
-TRUE
-3
-TRUE
-4
-4
-1
-4
-TRUE
diff --git a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/025-large-values.in b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/025-large-values.in
deleted file mode 100644
index 43968d00..00000000
--- a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/025-large-values.in
+++ /dev/null
@@ -1,14 +0,0 @@
-3
-12
-INSERT_FRONT 1000000000000
-INSERT_LAST -1000000000000
-FRONT
-REAR
-DELETE_FRONT
-INSERT_LAST 0
-REAR
-SIZE
-DELETE_LAST
-DELETE_FRONT
-EMPTY
-FULL
diff --git a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/025-large-values.out b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/025-large-values.out
deleted file mode 100644
index 6b8219a0..00000000
--- a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/025-large-values.out
+++ /dev/null
@@ -1,12 +0,0 @@
-TRUE
-TRUE
-1000000000000
--1000000000000
-1000000000000
-TRUE
-0
-2
-0
--1000000000000
-TRUE
-FALSE
diff --git a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/cases.json b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/cases.json
index 9455ab3b..aca9ce70 100644
--- a/labs/chapter-02/exercise/E-02-06-circular-deque/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-06-circular-deque/tests/cases.json
@@ -3,7 +3,7 @@
     "id": "001-sample",
     "input": "tests/001-sample.in",
     "expected": "tests/001-sample.out",
-    "points": 10,
+    "points": 8,
     "tags": [
       "sample"
     ],
@@ -15,7 +15,7 @@
     "id": "002-bidirectional-wrap",
     "input": "tests/002-bidirectional-wrap.in",
     "expected": "tests/002-bidirectional-wrap.out",
-    "points": 20,
+    "points": 8,
     "tags": [
       "boundary"
     ]
@@ -24,7 +24,7 @@
     "id": "003-capacity-one",
     "input": "tests/003-capacity-one.in",
     "expected": "tests/003-capacity-one.out",
-    "points": 20,
+    "points": 8,
     "tags": [
       "boundary"
     ]
@@ -33,7 +33,7 @@
     "id": "004-empty-and-full-stability",
     "input": "tests/004-empty-and-full-stability.in",
     "expected": "tests/004-empty-and-full-stability.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "error"
     ]
@@ -42,7 +42,7 @@
     "id": "005-alternating",
     "input": "tests/005-alternating.in",
     "expected": "tests/005-alternating.out",
-    "points": 15,
+    "points": 8,
     "tags": [
       "normal"
     ]
@@ -51,30 +51,138 @@
     "id": "006-scale-wraparound",
     "input": "tests/006-scale-wraparound.in",
     "expected": "tests/006-scale-wraparound.out",
-    "points": 1,
+    "points": 4,
     "tags": [
       "scale",
       "complexity",
       "wraparound"
     ]
   },
-  {"id":"007-fill-and-reject","input":"tests/007-fill-and-reject.in","expected":"tests/007-fill-and-reject.out","points":1,"tags":["boundary","error"]},
-  {"id":"008-front-only-wrap","input":"tests/008-front-only-wrap.in","expected":"tests/008-front-only-wrap.out","points":1,"tags":["wraparound"]},
-  {"id":"009-last-only-wrap","input":"tests/009-last-only-wrap.in","expected":"tests/009-last-only-wrap.out","points":1,"tags":["wraparound"]},
-  {"id":"010-capacity-two","input":"tests/010-capacity-two.in","expected":"tests/010-capacity-two.out","points":1,"tags":["boundary"]},
-  {"id":"011-int64-values","input":"tests/011-int64-values.in","expected":"tests/011-int64-values.out","points":1,"tags":["boundary"]},
-  {"id":"012-empty-repeated","input":"tests/012-empty-repeated.in","expected":"tests/012-empty-repeated.out","points":1,"tags":["error"]},
-  {"id":"013-peek-stability","input":"tests/013-peek-stability.in","expected":"tests/013-peek-stability.out","points":1,"tags":["regression"]},
-  {"id":"014-drain-refill","input":"tests/014-drain-refill.in","expected":"tests/014-drain-refill.out","points":1,"tags":["normal"]},
-  {"id":"015-alternating","input":"tests/015-alternating.in","expected":"tests/015-alternating.out","points":1,"tags":["normal"]},
-  {"id":"016-extreme-values","input":"tests/016-extreme-values.in","expected":"tests/016-extreme-values.out","points":1,"tags":["boundary"]},
-  {"id":"017-double-wrap","input":"tests/017-double-wrap.in","expected":"tests/017-double-wrap.out","points":1,"tags":["regression"]},
-  {"id":"018-front-last-mix","input":"tests/018-front-last-mix.in","expected":"tests/018-front-last-mix.out","points":1,"tags":["normal"]},
-  {"id":"019-capacity-three","input":"tests/019-capacity-three.in","expected":"tests/019-capacity-three.out","points":1,"tags":["boundary"]},
-  {"id":"020-drain-and-fill","input":"tests/020-drain-and-fill.in","expected":"tests/020-drain-and-fill.out","points":1,"tags":["normal"]},
-  {"id":"021-failed-inserts","input":"tests/021-failed-inserts.in","expected":"tests/021-failed-inserts.out","points":1,"tags":["error"]},
-  {"id":"022-negative-cycle","input":"tests/022-negative-cycle.in","expected":"tests/022-negative-cycle.out","points":1,"tags":["normal"]},
-  {"id":"023-empty-status","input":"tests/023-empty-status.in","expected":"tests/023-empty-status.out","points":1,"tags":["boundary"]},
-  {"id":"024-reuse-after-wrap","input":"tests/024-reuse-after-wrap.in","expected":"tests/024-reuse-after-wrap.out","points":1,"tags":["regression"]},
-  {"id":"025-large-values","input":"tests/025-large-values.in","expected":"tests/025-large-values.out","points":1,"tags":["boundary"]}
+  {
+    "id": "007-fill-and-reject",
+    "input": "tests/007-fill-and-reject.in",
+    "expected": "tests/007-fill-and-reject.out",
+    "points": 4,
+    "tags": [
+      "boundary",
+      "error"
+    ]
+  },
+  {
+    "id": "008-front-only-wrap",
+    "input": "tests/008-front-only-wrap.in",
+    "expected": "tests/008-front-only-wrap.out",
+    "points": 4,
+    "tags": [
+      "wraparound"
+    ]
+  },
+  {
+    "id": "009-last-only-wrap",
+    "input": "tests/009-last-only-wrap.in",
+    "expected": "tests/009-last-only-wrap.out",
+    "points": 4,
+    "tags": [
+      "wraparound"
+    ]
+  },
+  {
+    "id": "010-capacity-two",
+    "input": "tests/010-capacity-two.in",
+    "expected": "tests/010-capacity-two.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "011-int64-values",
+    "input": "tests/011-int64-values.in",
+    "expected": "tests/011-int64-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "012-empty-repeated",
+    "input": "tests/012-empty-repeated.in",
+    "expected": "tests/012-empty-repeated.out",
+    "points": 4,
+    "tags": [
+      "error"
+    ]
+  },
+  {
+    "id": "013-peek-stability",
+    "input": "tests/013-peek-stability.in",
+    "expected": "tests/013-peek-stability.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "014-drain-refill",
+    "input": "tests/014-drain-refill.in",
+    "expected": "tests/014-drain-refill.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-alternating",
+    "input": "tests/015-alternating.in",
+    "expected": "tests/015-alternating.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-extreme-values",
+    "input": "tests/016-extreme-values.in",
+    "expected": "tests/016-extreme-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "017-double-wrap",
+    "input": "tests/017-double-wrap.in",
+    "expected": "tests/017-double-wrap.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "018-front-last-mix",
+    "input": "tests/018-front-last-mix.in",
+    "expected": "tests/018-front-last-mix.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "019-capacity-three",
+    "input": "tests/019-capacity-three.in",
+    "expected": "tests/019-capacity-three.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "020-drain-and-fill",
+    "input": "tests/020-drain-and-fill.in",
+    "expected": "tests/020-drain-and-fill.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  }
 ]
diff --git a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/021-single-element.in b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/021-single-element.in
deleted file mode 100644
index dd5eb5d5..00000000
--- a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/021-single-element.in
+++ /dev/null
@@ -1,3 +0,0 @@
-1
-1
-42
diff --git a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/021-single-element.out b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/021-single-element.out
deleted file mode 100644
index d81cc071..00000000
--- a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/021-single-element.out
+++ /dev/null
@@ -1 +0,0 @@
-42
diff --git a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/022-wide-mixed.in b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/022-wide-mixed.in
deleted file mode 100644
index 8f246f1a..00000000
--- a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/022-wide-mixed.in
+++ /dev/null
@@ -1,3 +0,0 @@
-9
-5
-8 -3 5 1 9 -2 6 0 4
diff --git a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/022-wide-mixed.out b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/022-wide-mixed.out
deleted file mode 100644
index e4dbcfd0..00000000
--- a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/022-wide-mixed.out
+++ /dev/null
@@ -1 +0,0 @@
-9 9 9 9 9
diff --git a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/023-repeated-maxima.in b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/023-repeated-maxima.in
deleted file mode 100644
index 6acb1739..00000000
--- a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/023-repeated-maxima.in
+++ /dev/null
@@ -1,3 +0,0 @@
-8
-4
-2 2 1 2 2 0 2 2
diff --git a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/023-repeated-maxima.out b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/023-repeated-maxima.out
deleted file mode 100644
index fd4deaa8..00000000
--- a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/023-repeated-maxima.out
+++ /dev/null
@@ -1 +0,0 @@
-2 2 2 2 2
diff --git a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/024-large-range.in b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/024-large-range.in
deleted file mode 100644
index b95927f7..00000000
--- a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/024-large-range.in
+++ /dev/null
@@ -1,3 +0,0 @@
-5
-2
--1000000000 1000000000 -999999999 999999999 0
diff --git a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/024-large-range.out b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/024-large-range.out
deleted file mode 100644
index 38c1b79f..00000000
--- a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/024-large-range.out
+++ /dev/null
@@ -1 +0,0 @@
-1000000000 1000000000 999999999 999999999
diff --git a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/025-decreasing-window.in b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/025-decreasing-window.in
deleted file mode 100644
index be00a407..00000000
--- a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/025-decreasing-window.in
+++ /dev/null
@@ -1,3 +0,0 @@
-9
-5
-9 8 7 6 5 4 3 2 1
diff --git a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/025-decreasing-window.out b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/025-decreasing-window.out
deleted file mode 100644
index 721f9fd5..00000000
--- a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/025-decreasing-window.out
+++ /dev/null
@@ -1 +0,0 @@
-9 8 7 6 5
diff --git a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/cases.json b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/cases.json
index 4637b8a5..50cdcaa4 100644
--- a/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-07-sliding-window-maximum/tests/cases.json
@@ -3,8 +3,10 @@
     "id": "001-sample",
     "input": "tests/001-sample.in",
     "expected": "tests/001-sample.out",
-    "points": 5,
-    "tags": ["sample"],
+    "points": 8,
+    "tags": [
+      "sample"
+    ],
     "compare": {
       "mode": "exact"
     }
@@ -13,66 +15,172 @@
     "id": "002-window-one",
     "input": "tests/002-window-one.in",
     "expected": "tests/002-window-one.out",
-    "points": 15,
-    "tags": ["boundary"]
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
   },
   {
     "id": "003-window-all",
     "input": "tests/003-window-all.in",
     "expected": "tests/003-window-all.out",
-    "points": 15,
-    "tags": ["boundary"]
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
   },
   {
     "id": "004-increasing",
     "input": "tests/004-increasing.in",
     "expected": "tests/004-increasing.out",
-    "points": 10,
-    "tags": ["normal"]
+    "points": 8,
+    "tags": [
+      "normal"
+    ]
   },
   {
     "id": "005-decreasing",
     "input": "tests/005-decreasing.in",
     "expected": "tests/005-decreasing.out",
-    "points": 15,
-    "tags": ["normal"]
+    "points": 8,
+    "tags": [
+      "normal"
+    ]
   },
   {
     "id": "006-duplicate-maxima",
     "input": "tests/006-duplicate-maxima.in",
     "expected": "tests/006-duplicate-maxima.out",
-    "points": 10,
-    "tags": ["regression"]
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
   },
   {
     "id": "007-negative-values",
     "input": "tests/007-negative-values.in",
     "expected": "tests/007-negative-values.out",
-    "points": 10,
-    "tags": ["boundary"]
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
   },
   {
     "id": "008-scale",
     "input": "tests/008-scale.in",
     "expected": "tests/008-scale.out",
-    "points": 3,
-    "tags": ["scale", "complexity"]
-  },
-  {"id":"009-window-two","input":"tests/009-window-two.in","expected":"tests/009-window-two.out","points":1,"tags":["normal"]},
-  {"id":"010-all-equal","input":"tests/010-all-equal.in","expected":"tests/010-all-equal.out","points":1,"tags":["regression"]},
-  {"id":"011-large-values","input":"tests/011-large-values.in","expected":"tests/011-large-values.out","points":1,"tags":["boundary"]},
-  {"id":"012-negative-decreasing","input":"tests/012-negative-decreasing.in","expected":"tests/012-negative-decreasing.out","points":1,"tags":["normal"]},
-  {"id":"013-window-near-all","input":"tests/013-window-near-all.in","expected":"tests/013-window-near-all.out","points":1,"tags":["boundary"]},
-  {"id":"014-plateaus","input":"tests/014-plateaus.in","expected":"tests/014-plateaus.out","points":1,"tags":["regression"]},
-  {"id":"015-mixed-signs","input":"tests/015-mixed-signs.in","expected":"tests/015-mixed-signs.out","points":1,"tags":["normal"]},
-  {"id":"016-window-two","input":"tests/016-window-two.in","expected":"tests/016-window-two.out","points":1,"tags":["normal"]},
-  {"id":"017-window-near-all","input":"tests/017-window-near-all.in","expected":"tests/017-window-near-all.out","points":1,"tags":["boundary"]},
-  {"id":"018-extreme-values","input":"tests/018-extreme-values.in","expected":"tests/018-extreme-values.out","points":1,"tags":["boundary"]},
-  {"id":"019-alternating-peaks","input":"tests/019-alternating-peaks.in","expected":"tests/019-alternating-peaks.out","points":1,"tags":["regression"]},
-  {"id":"020-negative-plateaus","input":"tests/020-negative-plateaus.in","expected":"tests/020-negative-plateaus.out","points":1,"tags":["normal"]},
-  {"id":"021-single-element","input":"tests/021-single-element.in","expected":"tests/021-single-element.out","points":1,"tags":["boundary"]},
-  {"id":"022-wide-mixed","input":"tests/022-wide-mixed.in","expected":"tests/022-wide-mixed.out","points":1,"tags":["normal"]},
-  {"id":"023-repeated-maxima","input":"tests/023-repeated-maxima.in","expected":"tests/023-repeated-maxima.out","points":1,"tags":["regression"]},
-  {"id":"024-large-range","input":"tests/024-large-range.in","expected":"tests/024-large-range.out","points":1,"tags":["boundary"]},
-  {"id":"025-decreasing-window","input":"tests/025-decreasing-window.in","expected":"tests/025-decreasing-window.out","points":1,"tags":["normal"]}
+    "points": 4,
+    "tags": [
+      "scale",
+      "complexity"
+    ]
+  },
+  {
+    "id": "009-window-two",
+    "input": "tests/009-window-two.in",
+    "expected": "tests/009-window-two.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "010-all-equal",
+    "input": "tests/010-all-equal.in",
+    "expected": "tests/010-all-equal.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "011-large-values",
+    "input": "tests/011-large-values.in",
+    "expected": "tests/011-large-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "012-negative-decreasing",
+    "input": "tests/012-negative-decreasing.in",
+    "expected": "tests/012-negative-decreasing.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-window-near-all",
+    "input": "tests/013-window-near-all.in",
+    "expected": "tests/013-window-near-all.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "014-plateaus",
+    "input": "tests/014-plateaus.in",
+    "expected": "tests/014-plateaus.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "015-mixed-signs",
+    "input": "tests/015-mixed-signs.in",
+    "expected": "tests/015-mixed-signs.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "016-window-two",
+    "input": "tests/016-window-two.in",
+    "expected": "tests/016-window-two.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "017-window-near-all",
+    "input": "tests/017-window-near-all.in",
+    "expected": "tests/017-window-near-all.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "018-extreme-values",
+    "input": "tests/018-extreme-values.in",
+    "expected": "tests/018-extreme-values.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "019-alternating-peaks",
+    "input": "tests/019-alternating-peaks.in",
+    "expected": "tests/019-alternating-peaks.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-negative-plateaus",
+    "input": "tests/020-negative-plateaus.in",
+    "expected": "tests/020-negative-plateaus.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  }
 ]
diff --git a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/021-large-flat.in b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/021-large-flat.in
deleted file mode 100644
index 8416d6a4..00000000
--- a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/021-large-flat.in
+++ /dev/null
@@ -1,2 +0,0 @@
-5
-1000000000 1000000000 1000000000 1000000000 1000000000
diff --git a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/021-large-flat.out b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/021-large-flat.out
deleted file mode 100644
index d007f6b2..00000000
--- a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/021-large-flat.out
+++ /dev/null
@@ -1 +0,0 @@
-5000000000
diff --git a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/022-alternating-heights.in b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/022-alternating-heights.in
deleted file mode 100644
index d4cb2953..00000000
--- a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/022-alternating-heights.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7
-1 3 1 3 1 3 1
diff --git a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/022-alternating-heights.out b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/022-alternating-heights.out
deleted file mode 100644
index 7f8f011e..00000000
--- a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/022-alternating-heights.out
+++ /dev/null
@@ -1 +0,0 @@
-7
diff --git a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/023-double-plateau.in b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/023-double-plateau.in
deleted file mode 100644
index 15af0dc4..00000000
--- a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/023-double-plateau.in
+++ /dev/null
@@ -1,2 +0,0 @@
-8
-4 4 1 4 4 2 4 4
diff --git a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/023-double-plateau.out b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/023-double-plateau.out
deleted file mode 100644
index f599e28b..00000000
--- a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/023-double-plateau.out
+++ /dev/null
@@ -1 +0,0 @@
-10
diff --git a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/024-zero-edges.in b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/024-zero-edges.in
deleted file mode 100644
index cb250182..00000000
--- a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/024-zero-edges.in
+++ /dev/null
@@ -1,2 +0,0 @@
-8
-0 2 2 2 0 5 5 0
diff --git a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/024-zero-edges.out b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/024-zero-edges.out
deleted file mode 100644
index f599e28b..00000000
--- a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/024-zero-edges.out
+++ /dev/null
@@ -1 +0,0 @@
-10
diff --git a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/025-large-mixed.in b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/025-large-mixed.in
deleted file mode 100644
index 7d986b2a..00000000
--- a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/025-large-mixed.in
+++ /dev/null
@@ -1,2 +0,0 @@
-6
-1000000000 1 1000000000 1 1000000000 1000000000
diff --git a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/025-large-mixed.out b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/025-large-mixed.out
deleted file mode 100644
index 04b2646e..00000000
--- a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/025-large-mixed.out
+++ /dev/null
@@ -1 +0,0 @@
-2000000000
diff --git a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/cases.json b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/cases.json
index 307549f7..fdbb3d9f 100644
--- a/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-08-largest-rectangle-histogram/tests/cases.json
@@ -3,8 +3,10 @@
     "id": "001-sample",
     "input": "tests/001-sample.in",
     "expected": "tests/001-sample.out",
-    "points": 5,
-    "tags": ["sample"],
+    "points": 8,
+    "tags": [
+      "sample"
+    ],
     "compare": {
       "mode": "exact"
     }
@@ -13,72 +15,172 @@
     "id": "002-single-bar",
     "input": "tests/002-single-bar.in",
     "expected": "tests/002-single-bar.out",
-    "points": 10,
-    "tags": ["boundary"]
+    "points": 8,
+    "tags": [
+      "boundary"
+    ]
   },
   {
     "id": "003-increasing",
     "input": "tests/003-increasing.in",
     "expected": "tests/003-increasing.out",
-    "points": 15,
-    "tags": ["normal"]
+    "points": 8,
+    "tags": [
+      "normal"
+    ]
   },
   {
     "id": "004-decreasing",
     "input": "tests/004-decreasing.in",
     "expected": "tests/004-decreasing.out",
-    "points": 15,
-    "tags": ["normal"]
+    "points": 8,
+    "tags": [
+      "normal"
+    ]
   },
   {
     "id": "005-equal-heights",
     "input": "tests/005-equal-heights.in",
     "expected": "tests/005-equal-heights.out",
-    "points": 10,
-    "tags": ["regression"]
+    "points": 8,
+    "tags": [
+      "regression"
+    ]
   },
   {
     "id": "006-zero-gaps",
     "input": "tests/006-zero-gaps.in",
     "expected": "tests/006-zero-gaps.out",
-    "points": 10,
-    "tags": ["boundary"]
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
   },
   {
     "id": "007-valley",
     "input": "tests/007-valley.in",
     "expected": "tests/007-valley.out",
-    "points": 10,
-    "tags": ["regression"]
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
   },
   {
     "id": "008-large-area",
     "input": "tests/008-large-area.in",
     "expected": "tests/008-large-area.out",
-    "points": 5,
-    "tags": ["overflow"]
+    "points": 4,
+    "tags": [
+      "overflow"
+    ]
   },
   {
     "id": "009-scale",
     "input": "tests/009-scale.in",
     "expected": "tests/009-scale.out",
     "points": 4,
-    "tags": ["scale", "complexity"]
-  },
-  {"id":"010-two-bars","input":"tests/010-two-bars.in","expected":"tests/010-two-bars.out","points":1,"tags":["boundary"]},
-  {"id":"011-zero-only","input":"tests/011-zero-only.in","expected":"tests/011-zero-only.out","points":1,"tags":["boundary"]},
-  {"id":"012-tall-middle","input":"tests/012-tall-middle.in","expected":"tests/012-tall-middle.out","points":1,"tags":["normal"]},
-  {"id":"013-plateau-with-dips","input":"tests/013-plateau-with-dips.in","expected":"tests/013-plateau-with-dips.out","points":1,"tags":["regression"]},
-  {"id":"014-mixed-small","input":"tests/014-mixed-small.in","expected":"tests/014-mixed-small.out","points":1,"tags":["normal"]},
-  {"id":"015-large-height","input":"tests/015-large-height.in","expected":"tests/015-large-height.out","points":1,"tags":["overflow"]},
-  {"id":"016-two-levels","input":"tests/016-two-levels.in","expected":"tests/016-two-levels.out","points":1,"tags":["normal"]},
-  {"id":"017-zero-split","input":"tests/017-zero-split.in","expected":"tests/017-zero-split.out","points":1,"tags":["boundary"]},
-  {"id":"018-tall-edges","input":"tests/018-tall-edges.in","expected":"tests/018-tall-edges.out","points":1,"tags":["normal"]},
-  {"id":"019-nested-valleys","input":"tests/019-nested-valleys.in","expected":"tests/019-nested-valleys.out","points":1,"tags":["regression"]},
-  {"id":"020-single-zero","input":"tests/020-single-zero.in","expected":"tests/020-single-zero.out","points":1,"tags":["boundary"]},
-  {"id":"021-large-flat","input":"tests/021-large-flat.in","expected":"tests/021-large-flat.out","points":1,"tags":["overflow"]},
-  {"id":"022-alternating-heights","input":"tests/022-alternating-heights.in","expected":"tests/022-alternating-heights.out","points":1,"tags":["normal"]},
-  {"id":"023-double-plateau","input":"tests/023-double-plateau.in","expected":"tests/023-double-plateau.out","points":1,"tags":["regression"]},
-  {"id":"024-zero-edges","input":"tests/024-zero-edges.in","expected":"tests/024-zero-edges.out","points":1,"tags":["boundary"]},
-  {"id":"025-large-mixed","input":"tests/025-large-mixed.in","expected":"tests/025-large-mixed.out","points":1,"tags":["overflow"]}
+    "tags": [
+      "scale",
+      "complexity"
+    ]
+  },
+  {
+    "id": "010-two-bars",
+    "input": "tests/010-two-bars.in",
+    "expected": "tests/010-two-bars.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "011-zero-only",
+    "input": "tests/011-zero-only.in",
+    "expected": "tests/011-zero-only.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "012-tall-middle",
+    "input": "tests/012-tall-middle.in",
+    "expected": "tests/012-tall-middle.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "013-plateau-with-dips",
+    "input": "tests/013-plateau-with-dips.in",
+    "expected": "tests/013-plateau-with-dips.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "014-mixed-small",
+    "input": "tests/014-mixed-small.in",
+    "expected": "tests/014-mixed-small.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "015-large-height",
+    "input": "tests/015-large-height.in",
+    "expected": "tests/015-large-height.out",
+    "points": 4,
+    "tags": [
+      "overflow"
+    ]
+  },
+  {
+    "id": "016-two-levels",
+    "input": "tests/016-two-levels.in",
+    "expected": "tests/016-two-levels.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "017-zero-split",
+    "input": "tests/017-zero-split.in",
+    "expected": "tests/017-zero-split.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  },
+  {
+    "id": "018-tall-edges",
+    "input": "tests/018-tall-edges.in",
+    "expected": "tests/018-tall-edges.out",
+    "points": 4,
+    "tags": [
+      "normal"
+    ]
+  },
+  {
+    "id": "019-nested-valleys",
+    "input": "tests/019-nested-valleys.in",
+    "expected": "tests/019-nested-valleys.out",
+    "points": 4,
+    "tags": [
+      "regression"
+    ]
+  },
+  {
+    "id": "020-single-zero",
+    "input": "tests/020-single-zero.in",
+    "expected": "tests/020-single-zero.out",
+    "points": 4,
+    "tags": [
+      "boundary"
+    ]
+  }
 ]
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/README.md b/labs/chapter-02/exercise/E-02-09-bracket-matching/README.md
index 88353655..c5591274 100644
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/README.md
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/README.md
@@ -65,7 +65,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-09-bracket-matching
 pnpm lab:score -- labs/chapter-02/exercise/E-02-09-bracket-matching
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.in
deleted file mode 100644
index d8e343f3..00000000
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-([{}])][
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.out
deleted file mode 100644
index 5e35d1bf..00000000
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.in
deleted file mode 100644
index 2ddb7ff5..00000000
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-x(y[z]w)v
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.out
deleted file mode 100644
index f033a501..00000000
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.in
deleted file mode 100644
index 8de0b4b5..00000000
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-x(y[z}w)v
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.out
deleted file mode 100644
index 5e35d1bf..00000000
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.in
deleted file mode 100644
index fcd62c66..00000000
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-((((((((()))))))))
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.out
deleted file mode 100644
index f033a501..00000000
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-YES
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.in b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.in
deleted file mode 100644
index 708fe8f0..00000000
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-[({})](
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.out b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.out
deleted file mode 100644
index 5e35d1bf..00000000
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-NO
diff --git a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/cases.json b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-09-bracket-matching/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/README.md b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/README.md
index b8918618..5e37f80b 100644
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/README.md
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/README.md
@@ -67,7 +67,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-10-rpn-evaluation
 pnpm lab:score -- labs/chapter-02/exercise/E-02-10-rpn-evaluation
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.in
deleted file mode 100644
index 339b3730..00000000
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-5
-8 -3 / 2 +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.out
deleted file mode 100644
index 573541ac..00000000
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-0
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.in
deleted file mode 100644
index 192e9d9a..00000000
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-1
-42
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.out
deleted file mode 100644
index d81cc071..00000000
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-42
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.in
deleted file mode 100644
index e32a37e2..00000000
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-4
-1 2 3 +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.out
deleted file mode 100644
index 5df7507e..00000000
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-ERROR
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.in
deleted file mode 100644
index f73cfe71..00000000
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7
-3 4 + 2 * 7 /
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.out
deleted file mode 100644
index 0cfbf088..00000000
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-2
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.in b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.in
deleted file mode 100644
index 4b51a392..00000000
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-5
-16 2 2 * +
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.out b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.out
deleted file mode 100644
index 209e3ef4..00000000
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-20
diff --git a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/cases.json b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-10-rpn-evaluation/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/README.md b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/README.md
index 6abf8e41..ad9144bf 100644
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/README.md
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/README.md
@@ -65,7 +65,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-11-infix-to-postfix
 pnpm lab:score -- labs/chapter-02/exercise/E-02-11-infix-to-postfix
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.in
deleted file mode 100644
index fcc49a64..00000000
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-1+2*3
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.out
deleted file mode 100644
index 1544f920..00000000
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-123*+
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.in
deleted file mode 100644
index cb2a4d43..00000000
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-((a))
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.out
deleted file mode 100644
index 78981922..00000000
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-a
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.in
deleted file mode 100644
index 80bac433..00000000
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-a/(b-c)
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.out
deleted file mode 100644
index 0f615687..00000000
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-abc-/
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.in
deleted file mode 100644
index 58e275e9..00000000
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-a+((b*c)-d)
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.out
deleted file mode 100644
index 41c06973..00000000
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-abc*d-+
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.in b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.in
deleted file mode 100644
index 923c73c1..00000000
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-a+*b
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.out b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.out
deleted file mode 100644
index 5df7507e..00000000
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-ERROR
diff --git a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/cases.json b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-11-infix-to-postfix/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/README.md b/labs/chapter-02/exercise/E-02-12-next-greater-element/README.md
index 37aae664..b84422f8 100644
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/README.md
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/README.md
@@ -66,7 +66,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-12-next-greater-element
 pnpm lab:score -- labs/chapter-02/exercise/E-02-12-next-greater-element
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.in
deleted file mode 100644
index 4d4937eb..00000000
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-4
-1000000000 -1000000000 0 999999999
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.out
deleted file mode 100644
index d4612c8f..00000000
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
--1 0 999999999 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.in
deleted file mode 100644
index 35ef900d..00000000
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-6
-6 2 5 1 4 3
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.out
deleted file mode 100644
index 8139993e..00000000
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
--1 5 -1 4 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.in
deleted file mode 100644
index bfb0c78d..00000000
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7
-8 6 7 5 3 0 9
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.out
deleted file mode 100644
index ded565ba..00000000
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-9 7 9 9 9 9 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.in
deleted file mode 100644
index 5cc603ce..00000000
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-8
-1 4 2 8 5 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.out
deleted file mode 100644
index 6fdafab8..00000000
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-4 8 8 -1 7 -1 6 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.in b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.in
deleted file mode 100644
index 8f46cfea..00000000
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7
-12 1 11 2 10 3 9
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.out b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.out
deleted file mode 100644
index 7c30f7a8..00000000
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
--1 11 -1 10 -1 9 -1
diff --git a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/cases.json b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-12-next-greater-element/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/README.md b/labs/chapter-02/exercise/E-02-13-next-smaller-element/README.md
index 3ec2cc6a..9230bc0f 100644
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/README.md
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/README.md
@@ -66,7 +66,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-13-next-smaller-element
 pnpm lab:score -- labs/chapter-02/exercise/E-02-13-next-smaller-element
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.in
deleted file mode 100644
index 4d4937eb..00000000
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-4
-1000000000 -1000000000 0 999999999
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.out
deleted file mode 100644
index 9424218e..00000000
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
--1000000000 -1 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.in
deleted file mode 100644
index 35ef900d..00000000
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-6
-6 2 5 1 4 3
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.out
deleted file mode 100644
index 31fb5b3d..00000000
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-2 1 1 -1 3 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.in
deleted file mode 100644
index bfb0c78d..00000000
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7
-8 6 7 5 3 0 9
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.out
deleted file mode 100644
index f8667d74..00000000
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-6 5 5 3 0 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.in
deleted file mode 100644
index 5cc603ce..00000000
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-8
-1 4 2 8 5 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.out
deleted file mode 100644
index 9848ad1a..00000000
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
--1 2 -1 5 3 3 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.in b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.in
deleted file mode 100644
index 8f46cfea..00000000
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7
-12 1 11 2 10 3 9
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.out b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.out
deleted file mode 100644
index 92aa1130..00000000
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 -1 2 -1 3 -1 -1
diff --git a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/cases.json b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-13-next-smaller-element/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/README.md b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/README.md
index 605b1c00..8ed321eb 100644
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/README.md
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/README.md
@@ -66,7 +66,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-14-farmer-cow-bfs
 pnpm lab:score -- labs/chapter-02/exercise/E-02-14-farmer-cow-bfs
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.in
deleted file mode 100644
index de80d2c2..00000000
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-0 15 32
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.out
deleted file mode 100644
index 1e8b3149..00000000
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-6
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.in
deleted file mode 100644
index 85521d37..00000000
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-16 2 40
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.out
deleted file mode 100644
index 8351c193..00000000
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-14
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.in
deleted file mode 100644
index 7d410f46..00000000
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-5 29 60
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.out
deleted file mode 100644
index 7ed6ff82..00000000
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-5
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.in
deleted file mode 100644
index 65b316d0..00000000
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-14 31 64
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.out
deleted file mode 100644
index 00750edc..00000000
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-3
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.in b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.in
deleted file mode 100644
index 953645ce..00000000
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-21 42 80
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.out b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.out
deleted file mode 100644
index d00491fd..00000000
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1
diff --git a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/cases.json b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-14-farmer-cow-bfs/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/README.md b/labs/chapter-02/exercise/E-02-15-josephus-order/README.md
index 35706eee..de0e47c7 100644
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/README.md
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/README.md
@@ -67,7 +67,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-15-josephus-order
 pnpm lab:score -- labs/chapter-02/exercise/E-02-15-josephus-order
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.in
deleted file mode 100644
index ce3f1d21..00000000
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-30 11
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.out
deleted file mode 100644
index 883671d6..00000000
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-11 22 3 15 27 9 23 6 20 5 21 8 26 14 2 25 17 12 7 4 10 16 24 1 29 30 19 13 18 28
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.in
deleted file mode 100644
index f4590918..00000000
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-7 20
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.out
deleted file mode 100644
index c202a00c..00000000
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-6 1 7 5 3 2 4
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.in
deleted file mode 100644
index 741103d9..00000000
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-14 14
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.out
deleted file mode 100644
index 827a6ef2..00000000
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-14 1 3 6 10 4 12 11 2 9 5 8 7 13
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.in
deleted file mode 100644
index 68c9b89d..00000000
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-19 5
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.out
deleted file mode 100644
index ff6cc6a8..00000000
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-5 10 15 1 7 13 19 8 16 4 14 6 18 12 11 17 3 9 2
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.in b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.in
deleted file mode 100644
index 08d7add5..00000000
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-40 9
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.out b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.out
deleted file mode 100644
index 819fa82e..00000000
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-9 18 27 36 5 15 25 35 6 17 29 40 12 24 38 11 26 1 16 32 8 28 4 23 7 31 14 39 30 20 13 10 19 22 37 33 34 21 2 3
diff --git a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/cases.json b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-15-josephus-order/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-15-josephus-order/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/README.md b/labs/chapter-02/exercise/E-02-16-binary-number-queue/README.md
index 657f256a..a5d7504a 100644
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/README.md
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/README.md
@@ -66,7 +66,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-16-binary-number-queue
 pnpm lab:score -- labs/chapter-02/exercise/E-02-16-binary-number-queue
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.in
deleted file mode 100644
index 900731ff..00000000
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-64
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.out
deleted file mode 100644
index a37e92a9..00000000
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 1000000
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.in
deleted file mode 100644
index 78eb67ce..00000000
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-75
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.out
deleted file mode 100644
index c09ef981..00000000
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 1000000 1000001 1000010 1000011 1000100 1000101 1000110 1000111 1001000 1001001 1001010 1001011
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.in
deleted file mode 100644
index 3ad5abd0..00000000
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-99
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.out
deleted file mode 100644
index cd8f74bb..00000000
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 1000000 1000001 1000010 1000011 1000100 1000101 1000110 1000111 1001000 1001001 1001010 1001011 1001100 1001101 1001110 1001111 1010000 1010001 1010010 1010011 1010100 1010101 1010110 1010111 1011000 1011001 1011010 1011011 1011100 1011101 1011110 1011111 1100000 1100001 1100010 1100011
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.in
deleted file mode 100644
index c75acbe2..00000000
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-127
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.out
deleted file mode 100644
index 1c15cf81..00000000
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 1000000 1000001 1000010 1000011 1000100 1000101 1000110 1000111 1001000 1001001 1001010 1001011 1001100 1001101 1001110 1001111 1010000 1010001 1010010 1010011 1010100 1010101 1010110 1010111 1011000 1011001 1011010 1011011 1011100 1011101 1011110 1011111 1100000 1100001 1100010 1100011 1100100 1100101 1100110 1100111 1101000 1101001 1101010 1101011 1101100 1101101 1101110 1101111 1110000 1110001 1110010 1110011 1110100 1110101 1110110 1110111 1111000 1111001 1111010 1111011 1111100 1111101 1111110 1111111
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.in b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.in
deleted file mode 100644
index 08839f6b..00000000
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-200
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.out b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.out
deleted file mode 100644
index f1ee4012..00000000
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 1000000 1000001 1000010 1000011 1000100 1000101 1000110 1000111 1001000 1001001 1001010 1001011 1001100 1001101 1001110 1001111 1010000 1010001 1010010 1010011 1010100 1010101 1010110 1010111 1011000 1011001 1011010 1011011 1011100 1011101 1011110 1011111 1100000 1100001 1100010 1100011 1100100 1100101 1100110 1100111 1101000 1101001 1101010 1101011 1101100 1101101 1101110 1101111 1110000 1110001 1110010 1110011 1110100 1110101 1110110 1110111 1111000 1111001 1111010 1111011 1111100 1111101 1111110 1111111 10000000 10000001 10000010 10000011 10000100 10000101 10000110 10000111 10001000 10001001 10001010 10001011 10001100 10001101 10001110 10001111 10010000 10010001 10010010 10010011 10010100 10010101 10010110 10010111 10011000 10011001 10011010 10011011 10011100 10011101 10011110 10011111 10100000 10100001 10100010 10100011 10100100 10100101 10100110 10100111 10101000 10101001 10101010 10101011 10101100 10101101 10101110 10101111 10110000 10110001 10110010 10110011 10110100 10110101 10110110 10110111 10111000 10111001 10111010 10111011 10111100 10111101 10111110 10111111 11000000 11000001 11000010 11000011 11000100 11000101 11000110 11000111 11001000
diff --git a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/cases.json b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-16-binary-number-queue/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/README.md b/labs/chapter-02/exercise/E-02-17-palindrome-deque/README.md
index bb0b7787..ad86b958 100644
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/README.md
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/README.md
@@ -65,7 +65,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-17-palindrome-deque
 pnpm lab:score -- labs/chapter-02/exercise/E-02-17-palindrome-deque
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/021-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/021-regression.in
deleted file mode 100644
index 1c1b83c8..00000000
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/021-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-abcddcba
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/021-regression.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/021-regression.out
deleted file mode 100644
index f033a501..00000000
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/022-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/022-regression.in
deleted file mode 100644
index 0ca04436..00000000
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/022-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-abcdedcba
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/022-regression.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/022-regression.out
deleted file mode 100644
index f033a501..00000000
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/023-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/023-regression.in
deleted file mode 100644
index 00dedf6b..00000000
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/023-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-abcde
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/023-regression.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/023-regression.out
deleted file mode 100644
index 5e35d1bf..00000000
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-NO
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/024-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/024-regression.in
deleted file mode 100644
index 843e8610..00000000
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/024-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-zzxyzz
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/024-regression.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/024-regression.out
deleted file mode 100644
index 5e35d1bf..00000000
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-NO
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.in b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.in
deleted file mode 100644
index 84a5a1ec..00000000
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.in
+++ /dev/null
@@ -1 +0,0 @@
-a1b2b1a
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.out b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.out
deleted file mode 100644
index f033a501..00000000
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-YES
diff --git a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/cases.json b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-17-palindrome-deque/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/README.md b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/README.md
index a8c33d70..51480160 100644
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/README.md
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/README.md
@@ -65,7 +65,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-18-reverse-first-k-queue
 pnpm lab:score -- labs/chapter-02/exercise/E-02-18-reverse-first-k-queue
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.in
deleted file mode 100644
index 9285c1f8..00000000
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-4 0
-1000000000 -1000000000 0 999999999
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.out
deleted file mode 100644
index 5c4864af..00000000
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1000000000 -1000000000 0 999999999
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.in
deleted file mode 100644
index 54c7ce05..00000000
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-6 0
-6 2 5 1 4 3
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.out
deleted file mode 100644
index 87afb280..00000000
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-6 2 5 1 4 3
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.in
deleted file mode 100644
index 8f8a6e90..00000000
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7 6
-8 6 7 5 3 0 9
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.out
deleted file mode 100644
index c86268c2..00000000
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-0 3 5 7 6 8 9
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.in
deleted file mode 100644
index 41ef7d07..00000000
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-8 5
-1 4 2 8 5 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.out
deleted file mode 100644
index 758425dc..00000000
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-5 8 2 4 1 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.in b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.in
deleted file mode 100644
index 2ab8bca1..00000000
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7 0
-12 1 11 2 10 3 9
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.out b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.out
deleted file mode 100644
index 83e41fbe..00000000
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-12 1 11 2 10 3 9
diff --git a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/cases.json b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-18-reverse-first-k-queue/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/README.md b/labs/chapter-02/exercise/E-02-19-stack-sorting/README.md
index 7894e9b9..86489177 100644
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/README.md
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/README.md
@@ -66,7 +66,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-19-stack-sorting
 pnpm lab:score -- labs/chapter-02/exercise/E-02-19-stack-sorting
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.in
deleted file mode 100644
index 4d4937eb..00000000
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-4
-1000000000 -1000000000 0 999999999
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.out
deleted file mode 100644
index 547e1bb1..00000000
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
--1000000000 0 999999999 1000000000
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.in
deleted file mode 100644
index 35ef900d..00000000
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-6
-6 2 5 1 4 3
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.out
deleted file mode 100644
index b61b7c26..00000000
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 2 3 4 5 6
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.in
deleted file mode 100644
index bfb0c78d..00000000
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7
-8 6 7 5 3 0 9
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.out
deleted file mode 100644
index 7a92ea75..00000000
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-0 3 5 6 7 8 9
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.in
deleted file mode 100644
index 5cc603ce..00000000
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-8
-1 4 2 8 5 7 3 6
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.out
deleted file mode 100644
index 1f5ace83..00000000
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 2 3 4 5 6 7 8
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.in b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.in
deleted file mode 100644
index 8f46cfea..00000000
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7
-12 1 11 2 10 3 9
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.out b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.out
deleted file mode 100644
index cb63d762..00000000
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 2 3 9 10 11 12
diff --git a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/cases.json b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-19-stack-sorting/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/README.md b/labs/chapter-02/exercise/E-02-20-stock-span/README.md
index c1531b74..f0c27d5c 100644
--- a/labs/chapter-02/exercise/E-02-20-stock-span/README.md
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/README.md
@@ -66,7 +66,7 @@ pnpm lab:run -- labs/chapter-02/exercise/E-02-20-stock-span
 pnpm lab:score -- labs/chapter-02/exercise/E-02-20-stock-span
 ```
 
-- [ ] 全部 25 个公开测试通过。
+- [ ] 全部 20 个公开测试通过。
 - [ ] 能解释所选结构为何满足 LIFO/FIFO/单调候选的题意。
 - [ ] 能说明最坏或摊还时间复杂度。
 
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.in
deleted file mode 100644
index a5db4f61..00000000
--- a/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-4
-1000000001 1000000001 1 1000000000
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.out
deleted file mode 100644
index 24f529d4..00000000
--- a/labs/chapter-02/exercise/E-02-20-stock-span/tests/021-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 2 1 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.in
deleted file mode 100644
index 325f4108..00000000
--- a/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-6
-7 3 6 2 5 4
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.out
deleted file mode 100644
index 8c032f26..00000000
--- a/labs/chapter-02/exercise/E-02-20-stock-span/tests/022-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 1 2 1 2 1
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.in
deleted file mode 100644
index 9987e979..00000000
--- a/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7
-9 7 8 6 4 1 10
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.out
deleted file mode 100644
index 4386e890..00000000
--- a/labs/chapter-02/exercise/E-02-20-stock-span/tests/023-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 1 2 1 1 1 7
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.in
deleted file mode 100644
index cc8d5576..00000000
--- a/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-8
-2 5 3 9 6 8 4 7
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.out
deleted file mode 100644
index c852a611..00000000
--- a/labs/chapter-02/exercise/E-02-20-stock-span/tests/024-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 2 1 4 1 2 1 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.in b/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.in
deleted file mode 100644
index dc0bfec8..00000000
--- a/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.in
+++ /dev/null
@@ -1,2 +0,0 @@
-7
-13 2 12 3 11 4 10
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.out b/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.out
deleted file mode 100644
index a073493c..00000000
--- a/labs/chapter-02/exercise/E-02-20-stock-span/tests/025-regression.out
+++ /dev/null
@@ -1 +0,0 @@
-1 1 2 1 2 1 2
diff --git a/labs/chapter-02/exercise/E-02-20-stock-span/tests/cases.json b/labs/chapter-02/exercise/E-02-20-stock-span/tests/cases.json
index 1b4834f3..4859c8e4 100644
--- a/labs/chapter-02/exercise/E-02-20-stock-span/tests/cases.json
+++ b/labs/chapter-02/exercise/E-02-20-stock-span/tests/cases.json
@@ -48,7 +48,7 @@
     "id": "006-normal",
     "input": "tests/006-normal.in",
     "expected": "tests/006-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -57,7 +57,7 @@
     "id": "007-normal",
     "input": "tests/007-normal.in",
     "expected": "tests/007-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -66,7 +66,7 @@
     "id": "008-normal",
     "input": "tests/008-normal.in",
     "expected": "tests/008-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -75,7 +75,7 @@
     "id": "009-normal",
     "input": "tests/009-normal.in",
     "expected": "tests/009-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -84,7 +84,7 @@
     "id": "010-normal",
     "input": "tests/010-normal.in",
     "expected": "tests/010-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -93,7 +93,7 @@
     "id": "011-normal",
     "input": "tests/011-normal.in",
     "expected": "tests/011-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -102,7 +102,7 @@
     "id": "012-normal",
     "input": "tests/012-normal.in",
     "expected": "tests/012-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -111,7 +111,7 @@
     "id": "013-normal",
     "input": "tests/013-normal.in",
     "expected": "tests/013-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -120,7 +120,7 @@
     "id": "014-normal",
     "input": "tests/014-normal.in",
     "expected": "tests/014-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -129,7 +129,7 @@
     "id": "015-normal",
     "input": "tests/015-normal.in",
     "expected": "tests/015-normal.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "normal"
     ]
@@ -138,7 +138,7 @@
     "id": "016-regression",
     "input": "tests/016-regression.in",
     "expected": "tests/016-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -147,7 +147,7 @@
     "id": "017-regression",
     "input": "tests/017-regression.in",
     "expected": "tests/017-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -156,7 +156,7 @@
     "id": "018-regression",
     "input": "tests/018-regression.in",
     "expected": "tests/018-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -165,7 +165,7 @@
     "id": "019-regression",
     "input": "tests/019-regression.in",
     "expected": "tests/019-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]
@@ -174,52 +174,7 @@
     "id": "020-regression",
     "input": "tests/020-regression.in",
     "expected": "tests/020-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "021-regression",
-    "input": "tests/021-regression.in",
-    "expected": "tests/021-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "022-regression",
-    "input": "tests/022-regression.in",
-    "expected": "tests/022-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "023-regression",
-    "input": "tests/023-regression.in",
-    "expected": "tests/023-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "024-regression",
-    "input": "tests/024-regression.in",
-    "expected": "tests/024-regression.out",
-    "points": 3,
-    "tags": [
-      "regression"
-    ]
-  },
-  {
-    "id": "025-regression",
-    "input": "tests/025-regression.in",
-    "expected": "tests/025-regression.out",
-    "points": 3,
+    "points": 4,
     "tags": [
       "regression"
     ]

From adad9a3d650918576c26dfab260bd6729b40f9ce Mon Sep 17 00:00:00 2001
From: Jeff <3242284158@qq.com>
Date: Tue, 15 Sep 2026 09:17:17 +0800
Subject: [PATCH 3/3] exercises_expansion

---
 tests/pages-navigation.spec.mjs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/tests/pages-navigation.spec.mjs b/tests/pages-navigation.spec.mjs
index ba26b2de..19d153de 100644
--- a/tests/pages-navigation.spec.mjs
+++ b/tests/pages-navigation.spec.mjs
@@ -1251,7 +1251,7 @@ test("chapter 2 Lab sidebar groups labs into categorized 本章 Labs", async ({
   await page.keyboard.press("Enter");
   await expect(exerciseGroup).not.toHaveClass(/collapsed/);
   await expect(exerciseGroup.locator(".course-lab-category__empty")).toHaveCount(0);
-  await expect(exerciseGroup.locator(":scope > .items a")).toHaveCount(8);
+  await expect(exerciseGroup.locator(":scope > .items a")).toHaveCount(20);
   const exerciseLabs = [
     { title: "Lab 02-E-01：验证栈序列", slug: "exercise/E-02-01-validate-stack-sequences" },
     { title: "Lab 02-E-02：最小栈", slug: "exercise/E-02-02-min-stack" },
@@ -1264,6 +1264,18 @@ test("chapter 2 Lab sidebar groups labs into categorized 本章 Labs", async ({
       title: "Lab 02-E-08：柱状图中最大的矩形",
       slug: "exercise/E-02-08-largest-rectangle-histogram",
     },
+    { title: "Lab 02-E-09：括号匹配", slug: "exercise/E-02-09-bracket-matching" },
+    { title: "Lab 02-E-10：逆波兰表达式求值", slug: "exercise/E-02-10-rpn-evaluation" },
+    { title: "Lab 02-E-11：中缀表达式转后缀", slug: "exercise/E-02-11-infix-to-postfix" },
+    { title: "Lab 02-E-12：下一个更大元素", slug: "exercise/E-02-12-next-greater-element" },
+    { title: "Lab 02-E-13：下一个更小元素", slug: "exercise/E-02-13-next-smaller-element" },
+    { title: "Lab 02-E-14：农夫抓牛", slug: "exercise/E-02-14-farmer-cow-bfs" },
+    { title: "Lab 02-E-15：Josephus 出列顺序", slug: "exercise/E-02-15-josephus-order" },
+    { title: "Lab 02-E-16：队列生成二进制数", slug: "exercise/E-02-16-binary-number-queue" },
+    { title: "Lab 02-E-17：双端队列回文检查", slug: "exercise/E-02-17-palindrome-deque" },
+    { title: "Lab 02-E-18：反转队列前 K 个元素", slug: "exercise/E-02-18-reverse-first-k-queue" },
+    { title: "Lab 02-E-19：仅用辅助栈排序", slug: "exercise/E-02-19-stack-sorting" },
+    { title: "Lab 02-E-20：股票价格跨度", slug: "exercise/E-02-20-stock-span" },
   ];
   for (const { title, slug } of exerciseLabs) {
     const link = exerciseGroup.getByRole("link", { name: labSidebarTitle(title) });