View Code of Problem 51

#include<stdio.h>
#include<string.h> 
int main(void)
{
    int n;
    scanf("%d",&n);
    int a[n][n],i,j,sum=0;
    for(i=0;i<n;i++)
    {
    	for(j=0;j<n;j++)
    	  scanf("%d",&a[i][j]);
	}
	for(i=0;i<n;i++)
    {
    	for(j=0;j<=i;j++)
    	  sum+=a[i][j];
	}
	printf("%d",sum);
}