code4sk/c/sourcecode/朱森森带领的奇妙冒险/数组2/矩阵运算.cpp

//¾ØÕóÔËËã
#include<stdio.h>
int main()
{
	int n, a[10][10];
	int i, j, sum=0;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		for(j=0;j<n;j++)
		{
			scanf("%d", &a[i][j]);
			if(!(i+j==n-1||i==n-1||j==n-1))
			sum+=a[i][j];
		}
	}
	printf("%d",sum);
	return 0;
 }