[백준] 자바 문제 풀이 1715 : 골드4

BOJ 1715 풀이 코드

import java.io.*;
import java.util.PriorityQueue;
import java.util.StringTokenizer;

public class Main {

    public static void main(String[] args) throws Exception {
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        int n = Integer.parseInt(br.readLine());

        PriorityQueue<Integer> pq = new PriorityQueue<>();

        for(int i = 0; i < n; i++) {
            pq.add(Integer.parseInt(br.readLine()));
        }
        int total = 0;
        if(n != 1){
            while (pq.size() > 2) {
                int num = pq.poll() + pq.poll();
                total += num;
                pq.add(num);
            }
            total = total + pq.poll() + pq.poll();
        }
        bw.write(total + "\n");


        bw.flush();
        bw.close();
        br.close();
    }
}