11399번) ATM - 그리디

문제 출처 : https://www.acmicpc.net/problem/11399

import java.util.ArrayList; import java.util.Collections; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int num = scanner.nextInt(); ArrayList<Integer> number = new ArrayList<Integer>(); for ( int  i = 0; i < num; i++ ) { number.add(scanner.nextInt()); } Collections.sort(number); int sum = 0; for ( int i = 0; i < num; i++ ) { sum += number.get(i) * (num - i); } System.out.println(sum); } }