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  1. require 'matrix'
  2.  
  3. class Board
  4.   def initialize(pc_turn)
  5.     @board_matrix = Matrix.build(3,3){0}
  6.     @identity = Matrix.identity(3)
  7.     @permutation_matrix = Matrix.rows(@identity.to_a.reverse)
  8.     @row_vec = Matrix.row_vector([1,1,1])
  9.     @markers = { 1 => "X", 0 => " ", -1 => "O" }
  10.     @pc_turn = pc_turn
  11.   end
  12.   def move(x,y)
  13.     return false if @board_matrix[x,y] != 0
  14.     tmp = @board_matrix.to_a
  15.     tmp[x][y] = pc_turn ? -1 : 1
  16.     @board_matrix = Matrix[tmp]
  17.     @pc_turn != @pc_turn
  18.     true
  19.   end
  20.   def win
  21.     # fancy matrix stuff 1 player wins, 0 draw, -1 pc wins
  22.     [@identity.column_vectors.map{ |vec| (@row_vec * @board_matrix * vec)[0]}.max_by{ |n| n.abs },
  23.      @identity.column_vectors.map{ |vec| (@row_vec * @board_matrix.t * vec)[0]}.max_by{ |n| n.abs },
  24.      @board_matrix.tr, (@permutation_matrix * @board_matrix).tr].max_by{ |n| n.abs} / 3
  25.   end
  26.   def to_str()
  27.     "+---+---+---+\n"+
  28.     @board_matrix.to_a.map do |row|
  29.       "| %s | %s | %s |\n+---+---+---+\n" % row.map{ |val|  @markers[val]}
  30.     end.join
  31.   end
  32. end
  33.  
Success #stdin #stdout 0.02s 6864KB
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https://ideone.com/iZW8C1
language:
Ruby (ruby 2.5.5)
created:
5 years ago
visibility:
public

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