Sudoku (Elaine & Luis)

gistfile1.txt

class Sudoku
  def initialize(string)
    string = string.split('')

    @board = Array.new(9){Array.new(9)}

    @board.each_index do |row|
      @board[row].each_index do |column|
        @board[row][column] = string.shift.to_i
        if @board[row][column] == 0
            @board[row][column] = (1..9).to_a
        end
      end
    end
  end

  def solve!
    15.times do
      check_rows
      check_columns
      check_box
      rows_one_index
      columns_one_index
      boxes_one_index
    end
    @board
  end
  
  def check_rows

    @board.map! do |row|
      row.map do |index|
        if index.class == Array
          index - row
        else
          index
        end
      end
    end
  end
  


  def check_columns
    @board = @board.transpose

    @board.map! do |col|
      col.map do |index|
        if index.class == Array
          index - col
        else
          index
        end 
      end
    end
    @board
  end

  def check_box
    box = @board

    box_1 = box[0][0..2] + box[1][0..2] + box[2][0..2]
    box_2 = box[0][3..5] + box[1][3..5] + box[2][3..5]
    box_3 = box[0][6..8] + box[1][6..8] + box[2][6..8]
    box_4 = box[3][0..2] + box[4][0..2] + box[5][0..2]
    box_5 = box[3][3..5] + box[4][3..5] + box[5][3..5]
    box_6 = box[3][6..8] + box[4][6..8] + box[5][6..8]
    box_7 = box[6][0..2] + box[7][0..2] + box[8][0..2]
    box_8 = box[6][3..5] + box[7][3..5] + box[8][3..5]
    box_9 = box[6][6..8] + box[7][6..8] + box[8][6..8]

    boxes = [box_1, box_2, box_3, box_4, box_5, box_6, box_7, box_8]

    boxes.map! do |box|
      box.map do |index|
        if index.class == Array
          index - box
        else
          index
        end
      end
    end
  end

  def rows_one_index
    
    @board.each do |row|
      row.map! do |index|
        if index.class == Array && index.size == 1
          index.join.to_i
        else
          index
        end
      end
    end
  end

  def columns_one_index
    @board = @board.transpose
    @board.each do |column|
      column.map! do |index|
        if index.class == Array && index.size == 1
          index.join.to_i
        else
          index 
        end
      end
    end
  end

  def boxes_one_index
    @board.each do |box|
      box.map! do |index|
        if index.class == Array && index.size == 1
          index.join.to_i
        else
          index
        end
      end
    end
  end

end
 
# The file has newlines at the end of each line, so we call
# String#chomp to remove them.
# board_string = File.readlines('sample.unsolved.txt').first.chomp


game = Sudoku.new("619030040270061008000047621486302079000014580031009060005720806320106057160400030")
# Remember: this will just fill out what it can and not "guess"
p game.solve!
# puts game.board
# p game.check_box
# p game.check_columns