1056. 组合数的和(15)

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner  in = new Scanner(System.in);
        int N = in.nextInt();
        int[] num = new int[N];
        int sum = 0;
        for ( int i = 0 ; i < N ; i++){
            num[i] = in.nextInt();
        }
        for ( int i = 0 ; i < N ; i++){
            for ( int j = 0 ; j < N ; j++){
                if ( i != j){
                    int tmp = num[i] * 10 + num[j];
                    sum += tmp;
                }
            }
        }
        System.out.print(sum);
        in.close();
    }

}