蛇形矩阵

#include<cstdio>
#include<cstring>
using namespace std;
int main()
{
    int n;
    int a[11][11];
    while(~scanf("%d",&n)){
        memset(a,0,sizeof(a));
        int tot = 1;
        int x,y;
        a[0][0] = 1;
        x = 0;y = 0;
        while(tot < n*n){
           while(y < n - 1 && !a[x][y+1]) a[x][++y] = ++tot; 
           while(x < n - 1 && !a[x+1][y]) a[++x][y] = ++tot;
           while(y >= 1 && !a[x][y-1]) a[x][--y] = ++tot;
           while(x >= 1 && !a[x-1][y]) a[--x][y] = ++tot;
        }
        if(n <= 3 ){
        for(x = 0 ; x < n ; x++){
            for(y = 0 ; y < n;y++){
                printf("%d ",a[x][y]);
            }
            printf("
");
           }
        }
        else if(n >= 4 && n <= 9){
            for(x = 0 ; x < n ; x++){
              for(y = 0 ; y < n ; y++)
                printf("%2d ",a[x][y]);
                
                printf("
");
           }
        }
        else {
            for(x = 0 ; x < n ; x++){
                for(y = 0 ; y < n ; y++){
               if( x == 5 && y == 3)
                printf("%2d ",a[x][y]);
               else 
                printf("%2d  ",a[x][y]);
                }
                printf("
");
            }
        }
                
    }
    return 0;
}