View Code of Problem 51

#include<stdio.h>
#include<algorithm>
#include<string>
#include<string.h>
#include<string>
#include<iostream>
using namespace std;
int main(){
	int n;int sum=0;
	cin>>n;
	for(int i=0;i<n;i++)
		for(int j=0;j<n;j++){
			int t;cin>>t;
			if(i>=j)
				sum=sum+t;	
		}
	cout<<sum<<endl;
}