Java 代码

import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);

        int n = cin.nextInt();

        while (n != 0)
        {
            for (int i = 1; i <= n; i ++)
            {
                for (int j = 1; j <= n; j ++)
                    System.out.print (Math.min(Math.min(i, n+1-i), Math.min(j, n+1-j)) + " ");

                System.out.print("\n");
            }
            System.out.println("");

            n = cin.nextInt();
        }
    }
}