class Board
	def initialize(size)
		@size = size
		@board = Array.new(@size, Array.new(@size))
		@state = nil
	end
	def put(x, y, color)
		@board[x][y] = color
		[[1,1],[1,0],[1,-1],[0,1]].each do |dir|
			pomx, pomy, counter = x+dir[0], y+dir[1], 1
			while @board[pomx][pomy] == color
				counter += 1
				pomx += dir[0]
				pomy += dir[1]
			end
			pomx, pomy = x-dir[0], y-dir[1]
			while @board[pomx][pomy] == color
				counter += 1
				pomx -= dir[0]
				pomy -= dir[1]
			end
			if counter == 5
				return color
			else
				return nil
			end
		end
	end
	def state
		@state
	end
end