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+1;++j)
              sum+=a[i][j];
            printf("%d",sum);




}

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