using System;
using System.Collections.Generic;
using System.Linq;
class MainClass {
static void Main() {
var board = new Board();
PlayState move;
move = TicTacToe.Next(board, Player.X, 0, 0);
Console.WriteLine(move);
move = TicTacToe.Next(board, Player.O, 1, 1);
Console.WriteLine(move);
move = TicTacToe.Next(board, Player.X, 1, 0);
Console.WriteLine(move);
move = TicTacToe.Next(board, Player.O, 2, 1);
Console.WriteLine(move);
move = TicTacToe.Next(board, Player.X, 2, 0);
Console.WriteLine(move);
}
}
public enum Player {
NoPlayerSet,
X,
O,
}
public class Board {
public Player[,] Grid = new Player[3, 3];
public Player CurrentPlayer = Player.X;
}
public enum PlayState {
Illegal,
Continue,
Draw,
X_Winner,
O_Winner,
}
public static class TicTacToe {
public static PlayState Next(Board board, Player player, int x, int y) {
if (board.CurrentPlayer != player) {
return PlayState.Illegal;
}
if (board.Grid[x, y] != Player.NoPlayerSet) {
return PlayState.Illegal;
}
board.Grid[x, y] = board.CurrentPlayer;
board.CurrentPlayer = board.CurrentPlayer == Player.X
? Player.O
: Player.X;
return PlayState.Continue;
}
}
