View Code of Problem 51

#include<stdio.h>
int main()
{
    int n;
	int i, j;
	int a;
	int sum = 0;
	scanf("%d", &n);
	if(n > 1&&n < 10)
	{
		for(i = 0; i < n; i++)
		{
			for(j = 0; j < n; j++)
			{
				scanf("%d", &a);
			    if(i >= j)
				{
				    sum += a;
				}
			}
		}
		printf("%d\n", sum);
	}
    return 0;
}

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