View Code of Problem 51

# include<stdio.h>
int main(void)
{
  int n,i,j,a[10][10],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);
  return 0;
}

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