View Code of Problem 51

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

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