已AC程式碼：

#include<cstdio>
#include<cstring>
using namespace std;
int main()
{
    int n;
    while(scanf("%d", &n) != EOF)
    {
        int a[n][n], top=1, x, y;
        x = -1;
        y = n-1;
        memset(a, 0, sizeof(a));
        while(top <= n*n)
        {
            while(x<n-1 && !a[x+1][y])   a[++x][y] = top++;
            while(y>0 && !a[x][y-1])   a[x][--y] = top++;
            while(x>0 && !a[x-1][y])   a[--x][y] = top++;
            while(y<n && !a[x][y+1])   a[x][++y] = top++;
        }
        for(int i=0; i<n; i++)
        {
            for(int j=0; j<n; j++)
                printf("%d ", a[i][j]);
            printf("\n");
        }
    }
    return 0;
}