diff --git a/0510/BOJ/P1764/P1764_noh.java b/0510/BOJ/P1764/P1764_noh.java
new file mode 100644
index 0000000..8d31a3a
--- /dev/null
+++ b/0510/BOJ/P1764/P1764_noh.java
@@ -0,0 +1,28 @@
+import java.util.Map;
+import java.util.Scanner;
+import java.util.TreeMap;
+
+public class Main {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        Map<String, Integer> mapp = new TreeMap<String, Integer>();
+        int n = sc.nextInt();
+        int m = sc.nextInt();
+        for (int i = 0; i < n; ++i) {
+            String name = sc.next();
+            mapp.put(name, 1);
+        }
+        int cnt = 0;
+        for (int i = 0; i < m; ++i) {
+            String name = sc.next();
+            if (mapp.get(name) != null) {
+                mapp.put(name, 2);
+                ++cnt;
+            }
+        }
+        System.out.println(cnt);
+        for (String name : mapp.keySet())
+            if (mapp.get(name) == 2)
+                System.out.println(name);
+    }
+}
\ No newline at end of file
diff --git a/0510/BOJ/P1780/P1780_noh.java b/0510/BOJ/P1780/P1780_noh.java
new file mode 100644
index 0000000..c53a772
--- /dev/null
+++ b/0510/BOJ/P1780/P1780_noh.java
@@ -0,0 +1,52 @@
+import java.util.Scanner;
+
+public class Main {
+    static int[][] board;
+    static int[] ans = new int[3];
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int n = sc.nextInt();
+        board = new int[n][n];
+        for (int i = 0; i < n; ++i)
+            for (int j = 0; j < n; ++j)
+                board[i][j] = sc.nextInt();
+
+        solve(0, 0, n);
+
+        for (int i = 0; i < 3; ++i)
+            System.out.println(ans[i]);
+    }
+
+    static void solve(int y, int x, int size) {
+        if (size == 1) {
+            ++ans[board[y][x] + 1];
+            return;
+        }
+        int ck = check(y, x, size);
+        if (ck == -1) {
+            int nSize = size / 3;
+            solve(y, x, nSize);
+            solve(y, x + nSize, nSize);
+            solve(y, x + 2 * nSize, nSize);
+            solve(y + nSize, x, nSize);
+            solve(y + nSize, x + nSize, nSize);
+            solve(y + nSize, x + 2 * nSize, nSize);
+            solve(y + 2 * nSize, x, nSize);
+            solve(y + 2 * nSize, x + nSize, nSize);
+            solve(y + 2 * nSize, x + 2 * nSize, nSize);
+        } else {
+            ++ans[ck];
+        }
+    }
+
+    // 다른게 있으면 -1 반환, 전부 같으면 그 숫자 + 1 반환
+    static int check(int y, int x, int size) {
+        int num = board[y][x];
+        for (int i = 0; i < size; ++i)
+            for (int j = 0; j < size; ++j)
+                if (board[y + i][x + j] != num)
+                    return -1;
+        return num + 1;
+    }
+}
\ No newline at end of file
diff --git a/0510/BOJ/P1927/P1927_noh.java b/0510/BOJ/P1927/P1927_noh.java
new file mode 100644
index 0000000..50802c8
--- /dev/null
+++ b/0510/BOJ/P1927/P1927_noh.java
@@ -0,0 +1,23 @@
+import java.util.PriorityQueue;
+import java.util.Scanner;
+
+public class Main {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        StringBuilder sb = new StringBuilder();
+        PriorityQueue<Integer> pq = new PriorityQueue<>();
+        int n = sc.nextInt();
+        for (int i = 0; i < n; ++i) {
+            int oper = sc.nextInt();
+            if (oper == 0) {
+                if (pq.isEmpty())
+                    sb.append("0\n");
+                else
+                    sb.append(pq.poll() + "\n");
+            } else {
+                pq.add(oper);
+            }
+        }
+        System.out.println(sb);
+    }
+}
\ No newline at end of file
diff --git "a/0510/Programmers/Lv1/\354\227\206\353\212\224\354\210\253\354\236\220\353\215\224\355\225\230\352\270\260_noh.java" "b/0510/Programmers/Lv1/\354\227\206\353\212\224\354\210\253\354\236\220\353\215\224\355\225\230\352\270\260_noh.java"
new file mode 100644
index 0000000..add1f59
--- /dev/null
+++ "b/0510/Programmers/Lv1/\354\227\206\353\212\224\354\210\253\354\236\220\353\215\224\355\225\230\352\270\260_noh.java"
@@ -0,0 +1,10 @@
+class Solution {
+    public int solution(int[] numbers) {
+        int answer = 45;
+
+        for (int i = 0; i < numbers.length; ++i)
+            answer -= numbers[i];
+
+        return answer;
+    }
+}
\ No newline at end of file
diff --git "a/0510/Programmers/Lv2/\354\225\225\354\266\225_noh.java" "b/0510/Programmers/Lv2/\354\225\225\354\266\225_noh.java"
new file mode 100644
index 0000000..6bd26b0
--- /dev/null
+++ "b/0510/Programmers/Lv2/\354\225\225\354\266\225_noh.java"
@@ -0,0 +1,38 @@
+import java.util.HashMap;
+import java.util.Map;
+
+class Solution {
+    public int[] solution(String msg) {
+        msg += "0";
+        int[] answer = {};
+
+        int[] temp = new int[1000];
+        int ansIdx = 0;
+
+        Map<String, Integer> mapp = new HashMap<String, Integer>();
+        int idx = 1;
+        for (int i = 0; i < 26; ++i)
+            mapp.put(Character.toString((char) ('A' + i)), idx++);
+
+        StringBuilder input = new StringBuilder();
+        for (int i = 0; i < msg.length() - 1; ++i) {
+            input.append(msg.substring(i, i + 1));
+            // 다음 문자까지 합친게 사전에 있으면
+            if (mapp.get(input + msg.substring(i + 1, i + 2)) != null) {
+                continue;
+            }
+            // 색인번호 출력
+            temp[ansIdx++] = mapp.get(input.toString());
+            // 사전 추가
+            mapp.put(input + msg.substring(i + 1, i + 2), idx++);
+            // 입력에서 제거
+            input = new StringBuilder();
+        }
+
+        answer = new int[ansIdx];
+        for (int i = 0; i < ansIdx; ++i)
+            answer[i] = temp[i];
+
+        return answer;
+    }
+}
\ No newline at end of file