题解 | #箭形图案#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext())
        {
            int n=sc.nextInt();
            for(int i=1;i<=n+1;i++)
            {
                for(int j=i;j<=n;j++)
                {
                    System.out.print("  ");
                }
                for(int j=1;j<=i;j++)
                {
                    System.out.print("*");
                }
                System.out.println();
            }
            for(int i=1;i<=n;i++)
            {
                for(int j=1;j<=i;j++)
                {
                    System.out.print("  ");
                }
                for(int j=n;j>=i;j--)
                {
                    System.out.print("*");
                }
                System.out.println();
            }
        }
    }
}