View Code of Problem 51

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



}