백준 11286 절댓값 힙(Java)

\https://www.acmicpc.net/problem/11286

11286번: 절댓값 힙

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Java 코드

 

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import java.util.Scanner;
import java.util.PriorityQueue;
import java.util.Comparator;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    StringBuilder sb = new StringBuilder();
    PriorityQueue<Integer> q = new PriorityQueue<>(new Comparator<Integer>() {
      public int compare(Integer o1, Integer o2) {
        int a = Math.abs(o1);
        int b = Math.abs(o2);
        
        if(a == b) return o1 - o2;
        else return a - b;
      }
    }); 
    
    int n = sc.nextInt();
    

    for(int i = 0; i < n; i++) {
      int num = sc.nextInt();
      if(num == 0) {
        if(q.isEmpty()) sb.append(0+"\n");
        else sb.append(q.poll()+"\n");
      }
      else q.add(num);
    }
    
    System.out.println(sb);
  }
}