Triangle

namespace Ex03_PrintingTriangle
{
    using System;
    public class Program
    {
        public static void Main()
        {
            int num = int.Parse(Console.ReadLine());
            PrintTriangle(num);
        }

        public static void PrintCol(int i)
        {
            for (int j = 1; j <= i; j++)
            {
                Console.Write($"{j} ");
            }
            Console.WriteLine();
        }

        public static void PrintTriangle(int n)
        {
            for (int i = 1; i <= n; i++)
            {
                PrintCol(i);
            }

            for (int i = n - 1; i >= 1; i--)
            {
                PrintCol(i);
            }
        }
    }
}