View Code of Problem 51

#include<iostream> 
#include <stdio.h>
#include <math.h>
#include "string.h"
using namespace std;
int main(){
	int n;
	cin>>n;
	int sum=0;
	int a[n][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=sum+a[i][j];
		}
	}
	cout<<sum<<endl;
	return 10;
}

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