View Code of Problem 51

#include<cstdio>
#include<iostream>
using namespace std;
int main(){
	int sum=0,n,a[10][10];
	cin >> n;
	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;
	return 0;
}