View Code of Problem 51

#include <iostream>
#include<stdio.h>
#include<string.h>
#include<math.h>
#include<string>
//#include<algorithm>
#include <iomanip>
using namespace std;
int main() {
	int n;
	cin >> n;
	int a[10][10];
	int sum = 0;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			cin >> a[i][j];
		}
	}
	for (int i = 0; i < n; i++) {
		for (int j = 0; j <= i; j++) {
			sum += a[i][j];
		}
	}
	cout << sum;
}