【C语言】蛇形填数

 1 #include<string.h>
 2 #define maxn 20
 3 int a[maxn][maxn];
 4 int main()
 5 {
 6     int n,x,y,tot = 0;
 7     scanf("%d",&n);
 8     memset(a,0,sizeof(a));
 9     tot = a[x=0][y=n-1] = 1;
10     while(tot < n*n)
11     {
12         while(x+1<n && ! a[x+1][y]) a[++x][y] = ++tot;
13         while(y-1>=0 && ! a[x][y-1]) a[x][--y] = ++tot;
14         while(x-1>=0 && ! a[x-1][y]) a[--x][y] = ++tot;
15         while(y+1<n && ! a[x][y+1]) a[x][++y] = ++tot;
16     }    
17     for(x = 0;x<n;x++)
18     {
19         for(y=0;y<n;y++) printf("%3d",a[x][y]);
20         printf("\n"); 
21     }
22     return 0;
23 }

 蛇形填数