View Code of Problem 51

#include<bits/stdc++.h>
using namespace std;
int a[11][11];
int main(){
	int n;
	cin>>n;
	int sum=0;
	for(int i=0;i<n;i++)
		for(int j=0;j<n;j++){
			cin>>a[i][j];
			if(j>=i)sum+=a[i][j];
		}
	cout<<sum<<endl;		
	return 0;
}