View Code of Problem 51

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int[][] a = new int[n][n];
		int sum = 0;
		for(int i = 0;i < n;i++) {
			for(int j = 0;j < n;j++) {
				a[i][j] = scanner.nextInt();
				if(j <= i) {
					sum += a[i][j];
				}
			}
		}
		System.out.println(sum);
	}
}

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