蛇形填数
#include<string.h>
#include<stdio.h>
#define MAXN 10
#include<stdlib.h>
int a[MAXN][MAXN];
int main()
{
int n,x,y,tot=0;
scanf("%d",&n);
memset(a,0,sizeof(a));
tot=a[x=0][y=n-1]=1;//一式多用
while(tot<n*n)
{
while(x+1<n&&!a[x+1][y])a[++x][y]=++tot;//两个限制1.不超行2.不覆盖
while(y-1>=0&&!a[x][y-1])a[x][--y]=++tot;
while(x-1>=0&&!a[x-1][y])a[--x][y]=++tot;
while(y+1<n&&!a[x][y+1])a[x][++y]=++tot;
}
for(x=0;x<n;x++)
{
for(y=0;y<n;y++)
printf("%3d",a[x][y]);
printf("\n");
}
system("pause");
return 0;
}