View Code of Problem 51

#include "stdio.h"
#include "math.h"
#include "string.h"

void main()
{
	int i,j,k;
	int a[11][11];
	int n,sum=0;
	scanf("%d",&n);
	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=sum+a[i][j];
		}
	}
	printf("%d",sum);
}