View Code of Problem 51

#include<stdio.h>
int main()
{
  int s[100][100],i,j,sum=0,n;
  scanf("%d",&n);
  for(i=0;i<n;i++)
	  for(j=0;j<n;j++)
		{scanf("%d",&s[i][j]);}
	for(i=0;i<n;i++)
		for(j=0;j<=i;j++)
			sum+=s[i][j];
	printf("%d\n",sum);
  return 0;
}