View Code of Problem 51

#include<stdio.h>
int main()
{
int n,i,j,a[6][6];
int sum=0;
  scanf("%d",&n);
  for(i=0;i<n;i++)
  { for(j=0;j<n;j++)
 {
scanf("%d",&a[i][j]); 
 if(j<=i)
     sum+=a[i][j];
 }

  }
     printf("%d",sum);
}