백준 - 2217 로프 (feat. java)

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

public class Main {
	static int N;
	static int[] K;
	
	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in); 
		
		N = sc.nextInt();
		K = new int[N];
		
		for (int i = 0; i < N; i++) {
			K[i] = sc.nextInt();
		}
		
		Arrays.sort(K);
		
		long max = 0;
		
		for (int i = N-1; i >=0; i--) {
			K[i] = K[i]*(N-i);
			if (max < K[i]) max = K[i];
		}
		
		System.out.println(max);
	}
}