using System;

​

public class Program{

    public static void Main(){

        // n設定邊長

        int n = 10;

        printTri(n ,0);

    }

    // 遞迴區塊

    private static void printTri(int length ,int spaceLength){

        // 結束跟繼續遞迴的條件

        if(length < 0){

            return;

        }else{

            printTri(length - 1, spaceLength + 1);

        }

        // 取得空白數後印出空白以及 "* "

        for (int i = 0; i < spaceLength; i++){  

            Console.Write(" ");

        }  

        for (int i = 0; i < length; i++){   

            Console.Write("* ");

        }

        // 換行

        Console.WriteLine("");

    }

}