using System;

using System.Drawing;

using System.Collections.Generic;

​

public enum Direction

{

Up,Down,Left,Right

}

​

public class Program

{

    static Game game;

    public static void Main()

    {

        game = new Game(9);

        game.direction = Direction.Right;

        for (int i = 0; i< 4;i++)

        {

            Update();

            game.Step();

        }

        game.direction = Direction.Up;

        for (int i = 0; i< 3;i++)

        {

            Update();

            game.Step();

        }

        Update();

    }

    static void Update()

    {

        for (int cols = 0;cols<game.MapSize;cols++,Console.Write("\n"))

            for (int rows = 0; rows< game.MapSize;rows++)

                Console.Write(game.Map[cols,rows]);

        Console.Write("\n");

    }

}

​

class Game

{

    public char[,] Map;

    public int MapSize;

    public List<SnakePart> snake;

    public Direction direction;

    public Game(int mapSize)

    {

        direction = Direction.Right;

        MapSize = mapSize;

        Map = new char[MapSize,MapSize];

        snake = new List<SnakePart>();

        DrawStartMap();

    }

    public void Step()

    {

        Point head = new Point(snake[0].point.X,snake[0].point.Y);

        if (direction == Direction.Right)head.Y++;

        else if (direction == Direction.Left)head.Y--;

        else if (direction == Direction.Up)head.X++;

        else head.X--;

        Map[snake[snake.Count - 1].point.X,snake[snake.Count - 1].point.Y] = '•';

        for (int i =1;i<snake.Count;i++)

             snake[i].point = snake[i-1].point;

        snake[0].point = head;

        for (int i = 0; i< snake.Count;i++)

            Map[snake[i].point.X, snake[i].point.Y] = '0';

    }

    private void DrawStartMap()

    {

        for (int cols = 0;cols<MapSize;cols++)

            for (int rows = 0; rows< MapSize;rows++)

                Map[cols,rows] = '•';

        snake.Clear();

        SnakePart head = new SnakePart(new Point(MapSize / 2,MapSize / 2));

        SnakePart head2 = new SnakePart(new Point(MapSize / 2,(MapSize / 2) - 1));

        SnakePart head3 = new SnakePart(new Point(MapSize / 2,(MapSize / 2) - 2));

        snake.Add(head);

        snake.Add(head2);

        snake.Add(head3);

        for (int i = 0; i< snake.Count;i++)

            Map[snake[i].point.X, snake[i].point.Y] = '0';

    }

}

​

class SnakePart

{

    public Point point;

    public SnakePart(Point p)

    {

        point = p;

    }

}