View Code of Problem 51

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,a[100][100],sum=0;
	cin>>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<n;j++)
	{
		if(i==j||j==0||i>j)
		sum=sum+a[i][j];
	}
	cout<<sum; 
	return 0;
 } 

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