From 0beed3849369173eed653598f8114aa2274706ef Mon Sep 17 00:00:00 2001
From: Leandro Lopes <ltlopes@gmail.com>
Date: Fri, 15 May 2026 16:13:01 -0700
Subject: [PATCH] Initial submission

---
 submissions/ltlopes.py | 57 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 submissions/ltlopes.py

diff --git a/submissions/ltlopes.py b/submissions/ltlopes.py
new file mode 100644
index 0000000..8863adb
--- /dev/null
+++ b/submissions/ltlopes.py
@@ -0,0 +1,57 @@
+import os
+from queue import SimpleQueue
+
+from concurrent.futures import ThreadPoolExecutor
+
+from graph import BuildGraph, Target
+
+def build_all(graph: BuildGraph) -> dict[str, bytes]:
+    """Build all targets in the graph, respecting dependency order.
+
+    Args:
+        graph: The build graph to execute.
+
+    Returns:
+        A dict mapping target name to its build result (bytes).
+    """
+
+    total = len(graph.targets)
+    results: dict[str, bytes] = {}
+
+    in_degree = {name: len(t.deps) for name, t in graph.targets.items()}
+    dependents: dict[str, list[Target]] = {name: [] for name in graph.targets}
+    for name, target in graph.targets.items():
+        for dep in target.deps:
+            dependents[dep.name].append(target)
+
+    roots = [t for t in graph.targets.values() if in_degree[t.name] == 0]
+    max_in = max(in_degree.values()) if in_degree else 0
+    if len(roots) == 1 and max_in <= 1:
+        cur = roots[0]
+        while True:
+            results[cur.name] = cur.build({d.name: results[d.name] for d in cur.deps})
+            nxts = dependents[cur.name]
+            if not nxts:
+                break
+            cur = nxts[0]
+        return results
+    done_queue: SimpleQueue[tuple[str, bytes]] = SimpleQueue()
+
+    def run(target: Target, dep_results: dict[str, bytes]) -> None:
+        done_queue.put((target.name, target.build(dep_results)))
+
+    with ThreadPoolExecutor(max_workers=os.cpu_count()*3) as executor:
+        for name, target in graph.targets.items():
+            if in_degree[name] == 0:
+                executor.submit(run, target, {})
+
+        for _ in range(total):
+            name, result = done_queue.get()
+            results[name] = result
+            for dependent in dependents[name]:
+                in_degree[dependent.name] -= 1
+                if in_degree[dependent.name] == 0:
+                    dep_results = {d.name: results[d.name] for d in dependent.deps}
+                    executor.submit(run, dependent, dep_results)
+
+    return results
\ No newline at end of file