[BOJ] 1927 : 최소 힙 (Java)

https://www.acmicpc.net/problem/1927

1927번: 최소 힙

걸린 시간 : 5분 18초

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정답 코드

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.PriorityQueue;

public class BOJ1927 {

    static PriorityQueue<Integer> pq = new PriorityQueue<>();
    static int N;

    public static void main(String[] args) throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        N = Integer.parseInt(bf.readLine());
        for (int i = 0; i < N; i++) {
            int input = Integer.parseInt(bf.readLine());
            if (input == 0) {
                if (pq.isEmpty()) {
                    System.out.println(0);
                } else {
                    System.out.println(pq.poll());
                }
            } else {
                pq.add(input);
            }
        }
    }
}