View Code of Problem 51

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

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