diff --git "a/ksinji/202511/20 PGM \355\230\270\355\205\224 \353\214\200\354\213\244.md" "b/ksinji/202511/20 PGM \355\230\270\355\205\224 \353\214\200\354\213\244.md"
new file mode 100644
index 00000000..9402a8a8
--- /dev/null
+++ "b/ksinji/202511/20 PGM \355\230\270\355\205\224 \353\214\200\354\213\244.md"	
@@ -0,0 +1,46 @@
+```java
+import java.util.*;
+
+class Solution {
+    public int solution(String[][] book_time) {
+        int n = book_time.length;
+        int[][] times = new int[n][2];
+        
+        for (int i = 0; i < n; i++) {
+            int start = toMinutes(book_time[i][0]);
+            int end = toMinutes(book_time[i][1]) + 10;
+            
+            times[i][0] = start;
+            times[i][1] = end;
+        }
+
+        Arrays.sort(times, (a, b) -> a[0] - b[0]);
+
+        PriorityQueue<Integer> pq = new PriorityQueue<>();
+
+        int answer = 0;
+        for (int i = 0; i < n; i++) {
+            int start = times[i][0];
+            int end = times[i][1];
+
+            while (!pq.isEmpty() && pq.peek() <= start) {
+                pq.poll();
+            }
+
+            pq.offer(end);
+
+            answer = Math.max(answer, pq.size());
+        }
+
+        return answer;
+    }
+
+    private int toMinutes(String time) {
+        String[] temp = time.split(":");
+        int h = Integer.parseInt(temp[0]);
+        int m = Integer.parseInt(temp[1]);
+        return h * 60 + m;
+    }
+}
+
+```