View Code of Problem 51

#include<iostream>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <cmath>
using namespace std;
#pragma warning(disable:4996)


int main() {
	int n;
	scanf("%d", &n);
	int m;
	int sum = 0;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			scanf("%d", &m);
			if (i >= j) {
				sum += m;
			}
		}
	}
	printf("%d", sum);
	return 0;
}