View Code of Problem 51

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