03. Memory Game

using System;
using System.Linq;
using System.Collections.Generic;

namespace MemoryGame
{
    class Program
    {
        static void Main(string[] args)
        {
            var game = Console.ReadLine().Split(' ').ToList();
            int counter = 1;
            string command;

            while ((command = Console.ReadLine()) != "end")
            {
                var index = command.Split(' ').Select(int.Parse).OrderBy(x => x).ToArray();

                if (index[0] >= 0 && index[0] < game.Count && index[1] >= 0 && index[1] < game.Count && index[0] != index[1])
                {
                    if (game[index[0]].Equals(game[index[1]]))
                    {
                        Console.WriteLine($"Congrats! You have found matching elements - {game[index[0]]}!");
                        game.RemoveAt(index[1]);
                        game.RemoveAt(index[0]);
                        if (game.Count == 0)
                        {
                            Console.WriteLine($"You have won in {counter} turns!");
                            Environment.Exit(0);
                        }
                    }
                    else
                    {
                        Console.WriteLine("Try again!");
                    }
                }
                else
                {
                    Console.WriteLine("Invalid input! Adding additional elements to the board");
                    game.InsertRange(game.Count / 2, new List<string> { $"-{counter}a", $"-{counter}a" });
                }
                counter++;
            }

            Console.WriteLine($"Sorry you lose :(\n{string.Join(" ", game)}");
        }
    }
}