View Code of Problem 51

#include<stdio.h>
#define N 10
int main()
{
  int a[N][N];
  int n,i,j,sum;
  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+=a[i][j];

  }
  printf("%d",sum);


}