[20250729] BOJ / G5 / 강의실 배정 / 이강현

lkhyun/202507/29 BOJ G5 강의실 배정.md

@@ -0,0 +1,35 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class Main {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+    static int N;
+
+    public static void main(String[] args) throws Exception {
+        N = Integer.parseInt(br.readLine());
+        List<int[]> arr = new LinkedList<>();
+
+        for (int i = 0; i < N; i++) {
+            st = new StringTokenizer(br.readLine());
+            arr.add(new int[]{Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken())});
+        }
+        Collections.sort(arr,(a,b) -> a[0] - b[0]);
+
+        PriorityQueue<Integer> pq = new PriorityQueue<>();
+
+        int ans = 1;
+        for (int[] cur : arr) {
+            while(!pq.isEmpty() && pq.peek() <= cur[0]){
+                pq.poll();
+            }
+            pq.offer(cur[1]);
+            ans = Math.max(ans,pq.size());
+        }
+        bw.write(ans+"");
+        bw.close();
+    }
+}
+```