[20251127] BOJ / G5 / 강의실 / 설진영

Author: Seol-JY

Seol-JY/202511/27 BOJ G5 강의실.md

@@ -0,0 +1,32 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int n = Integer.parseInt(br.readLine());
+        
+        int[][] lectures = new int[n][2];
+        for (int i = 0; i < n; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            st.nextToken();
+            lectures[i][0] = Integer.parseInt(st.nextToken());
+            lectures[i][1] = Integer.parseInt(st.nextToken());
+        }
+        
+        Arrays.sort(lectures, (a, b) -> a[0] - b[0]);
+        
+        PriorityQueue<Integer> pq = new PriorityQueue<>();
+        
+        for (int[] lecture : lectures) {
+            if (!pq.isEmpty() && pq.peek() <= lecture[0]) {
+                pq.poll();
+            }
+            pq.offer(lecture[1]);
+        }
+        
+        System.out.println(pq.size());
+    }
+}
+```