View Code of Problem 51

#include<iostream>
using namespace std;
int main(){
	int n;
	cin>>n;
	int a[n+1][n+1];
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++)
		cin>>a[i][j];
	}
	
	int sum=0;
	for(int i=1;i<=n;i++)
		for(int j=1;j<=n;j++){
			if(i>=j)	sum+=a[i][j];
		}
	
	
	cout<<sum;
	
	
}