Question

我正在使用minimax算法编写无与伦比的井字游戏。由于某种原因，我的分数哈希值在循环中丢失了它的值。如果发生这种情况，那么我必须做错了我无法发现的错误。我是编码新手。需要帮助！

标记是当前玩家的标记

mark1和mark2分别是玩家1和玩家2的两个标记

斑点是板上的空白点

require_relative 'board'

class ComputerPlayer
  attr_reader :board

  def initialize
    @board = Board.new
    @optimal_moves = [0, 2, 4, 6, 8]
  end

  def get_position(name, spots, mark, mark1, mark2)
    position = nil
    other_mark = nil
    mark == mark1 ? other_mark = mark2 : other_mark = mark1
    if spots.length == 9
      position = @optimal_moves.sample.to_i
    else
      position = best_move(spots, mark, other_mark)
    end
    print "Enter your move #{name}: #{position}\n"
    position
  end

  def best_move(spots, mark, other_mark, depth = 0, scores = {})
    return 1 if board.winner == mark
    return 0 if board.draw?
    return -1 if board.winner == other_mark

    spots.each do |move|
      board.place_mark(move, mark)
      scores[move] = best_move(spots[1..-1], mark, other_mark, depth += 1, {})
      board.reset_position(move)
    end

    # it does not keep the value of scores. scores here is {}
    return scores.max_by { |key, value| value }[0] if depth == 0
    return scores.max_by { |key, value| value }[1] if depth > 0
    return scores.min_by { |key, value| value }[1] if depth < 0
  end
end

Answer 1

似乎您每次都将一个空哈希传递回best_move。您可能想要做的是在每次重复中传递分数，以建立具有移动和分数的对象。

scores[move] = best_move(spots[1..-1], mark, other_mark, depth += 1, scores)

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