View Code of Problem 51

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