View Code of Problem 51

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