View Code of Problem 51

#include<stdio.h>
#include<math.h>
main()
{
	int a[10][10];
	int i,j,n,sum;
	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,j=0;i<n;i++){
    	for(j=0;i>=j;j++){
    		sum=sum+a[i][j];
		}		
	}
	printf("%d",sum);
}

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