View Code of Problem 51

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,a[15][15] = { };
	int sum = 0;
	cin>>n;
	for(int i = 0;i<n;i++){
		for(int j = 0;j<n;j++)
			cin>>a[i][j];
	}
	for(int j = 0;j<n;j++){
		for(int i = j;i < n;i++){
			sum  = sum + a[i][j];
		}
	}
	cout<<sum;
	
	
	return 0;
}