Simple_Tree

using System;

class Program
{
    static void Main()
    {
        int N = 5;
        int nStar = 0;
        int nSpace = 0;

        for (int i = 0; i <= N; i++)
        {
            nStar = i;
            nSpace = N - i;
            string row = new string(' ', nSpace);
            row += new string('*', nStar);
            row += '|';
            row += new string('*', nStar);
            row += new string(' ', nSpace);
            Console.WriteLine(row);
        }
    }
}