https://www.acmicpc.net/problem/11399 java

baekjoon11399.java

import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static int solve(int length, int[] times_to_wait_in_line) {
		Arrays.sort(times_to_wait_in_line);
    
		int cal = Arrays.stream(times_to_wait_in_line)
				.reduce((a, b) -> a + b)
				.getAsInt();
        
		int result = cal;
		for (int i = length - 1; i > 0; i--) {
			cal -= times_to_wait_in_line[i];
			result += cal;
		}
    
		return result;
	}
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int length = sc.nextInt();
		int[] times_to_wait_in_line = new int[length];
		for (int i = 0; i < length; i++) {
			times_to_wait_in_line[i] = sc.nextInt();
		}
		
		System.out.println(Main.solve(length, times_to_wait_in_line));
	}
}