[20251127] BOJ / G5 / 강의실 / 이준희

Author: JHLEE325

JHLEE325/202511/26 BOJ G5 강의실.md

@@ -0,0 +1,45 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    static class study {
+        int s, e;
+        study(int s, int e) {
+            this.s = s;
+            this.e = e;
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st;
+        int N = Integer.parseInt(br.readLine());
+
+        study[] arr = new study[N];
+
+        for (int i = 0; i < N; i++) {
+            st = new StringTokenizer(br.readLine());
+            st.nextToken();
+            int s = Integer.parseInt(st.nextToken());
+            int e = Integer.parseInt(st.nextToken());
+            arr[i] = new study(s, e);
+        }
+
+        Arrays.sort(arr, (a, b) -> a.s - b.s);
+
+        PriorityQueue<Integer> pq = new PriorityQueue<>();
+
+        for (study s : arr) {
+            if (!pq.isEmpty() && pq.peek() <= s.s) {
+                pq.poll();
+            }
+
+            pq.offer(s.e);
+        }
+
+        System.out.println(pq.size());
+    }
+}
+```