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class Color | |
def initialize | |
@colors = ["R", "G", "B"] # => ["R", "G", "B"], ["R", "G", "B"] | |
end | |
def get | |
c = @colors.first # => "R", "G", "B", "R", "G", "B", "R", "G", "B", "R", "G", "B", "R", "G", "B", "R", "G", "B", "R", "G", "B", "R", "G", "B", "R" | |
@colors = @colors.rotate # => ["G", "B", "R"], ["B", "R", "G"], ["R", "G", "B"], ["G", "B", "R"], ["B", "R", "G"], ["R", "G", "B"], ["G", "B", "R"], ["B", "R", "G"], ["R", "G", "B"], ["G", "B", "R"], ["B", "R", "G"], ["R", "G", "B"], ["G", "B", "R"], ["B", "R", "G"], ["R", "G", "B"], ["G", "B", "R"], ["B", "R", "G"], ["R", "G", "B"], ["G", "B", "R"], ["B", "R", "G"], ["R", "G", "B"], ["G", "B", "R"], ["B", "R", "G"], ["R", "G", "B"], ["G", "B", "R"] | |
c # => "R", "G", "B", "R", "G", "B", "R", "G", "B", "R", "G", "B", "R", "G", "B", "R", "G", "B", "R", "G", "B", "R", "G", "B", "R" | |
end | |
end | |
class Chessboard | |
def initialize(size) | |
@board = Array.new(size) { Array.new(size,0) } # => [[0, 0, 0], [0, 0, 0], [0, 0, 0]], [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]] | |
@size = size # => 3, 4 | |
@color = Color.new # => #<Color:0x007fa7518bbcd0 @colors=["R", "G", "B"]>, #<Color:0x007fa7518b4e80 @colors=["R", "G", "B"]> | |
@board[0][0] = @color.get # => "R", "R" | |
@direction = :to_right # => :to_right, :to_right | |
@x = 0 # => 0, 0 | |
@y = 1 # => 1, 1 | |
end | |
def out_of_board? | |
@x < 0 || @y < 0 || @board[@x].nil? || @board[@x][@y].nil? || ["R", "G", "B"].include?(@board[@x][@y]) # => false, false, true, false, false, true, false, false, true, false, true, false, false, false, false, true, false, false, false, true, false, false, false, true, false, false, true, false, false, true, false, true, false | |
end | |
def solve | |
counter = 0 # => 0, 0 | |
while counter < @size**2 - 1 # => true, true, true, true, true, true, true, true, true, true, true, true, false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, false | |
if @direction == :to_right # => true, true, true, false, false, false, false, false, false, false, false, true, true, true, true, true, false, false, false, false, false, false, false, false, false, false, false, true, true, true, false, false, false | |
if out_of_board? # => false, false, true, false, false, false, false, true, false, false, true | |
@direction = :to_bottom # => :to_bottom, :to_bottom, :to_bottom | |
@y -= 1 # => 2, 3, 2 | |
@x += 1 # => 1, 1, 2 | |
else | |
@board[@x][@y] = @color.get # => "G", "B", "B", "G", "B", "R", "R", "G" | |
@y += 1 # => 2, 3, 2, 2, 3, 4, 2, 3 | |
counter += 1 # => 1, 2, 8, 1, 2, 3, 12, 13 | |
end # => 1, 2, 1, 8, 1, 2, 3, 1, 12, 13, 2 | |
elsif @direction == :to_bottom # => true, true, true, false, false, false, false, false, true, true, true, true, false, false, false, false, false, false, false, true, true, false | |
if out_of_board? # => false, false, true, false, false, false, true, false, true | |
@direction = :to_left # => :to_left, :to_left, :to_left | |
@x -= 1 # => 2, 3, 2 | |
@y -= 1 # => 1, 2, 1 | |
else | |
@board[@x][@y] = @color.get # => "R", "G", "G", "B", "R", "B" | |
@x += 1 # => 2, 3, 2, 3, 4, 3 | |
counter += 1 # => 3, 4, 4, 5, 6, 14 | |
end # => 3, 4, 1, 4, 5, 6, 2, 14, 1 | |
elsif @direction == :to_left # => true, true, true, false, false, true, true, true, true, false, false, false, true | |
if out_of_board? # => false, false, true, false, false, false, true, false | |
@direction = :to_top # => :to_top, :to_top | |
@x -= 1 # => 1, 2 | |
@y += 1 # => 0, 0 | |
else | |
@board[@x][@y] = @color.get # => "B", "R", "G", "B", "R", "R" | |
@y -= 1 # => 0, -1, 1, 0, -1, 0 | |
counter += 1 # => 5, 6, 7, 8, 9, 15 | |
end # => 5, 6, 0, 7, 8, 9, 0, 15 | |
elsif @direction == :to_top # => true, true, true, true, true | |
if out_of_board? # => false, true, false, false, true | |
@direction = :to_right # => :to_right, :to_right | |
@x += 1 # => 1, 1 | |
@y += 1 # => 1, 1 | |
else | |
@board[@x][@y] = @color.get # => "G", "G", "B" | |
@x -= 1 # => 0, 1, 0 | |
counter += 1 # => 7, 10, 11 | |
end # => 7, 1, 10, 11, 1 | |
end # => 1, 2, 1, 3, 4, 1, 5, 6, 0, 7, 1, 8, 1, 2, 3, 1, 4, 5, 6, 2, 7, 8, 9, 0, 10, 11, 1, 12, 13, 2, 14, 1, 15 | |
end # => nil, nil | |
end | |
def to_s | |
solve # => nil, nil | |
@board.map { |l| l.join }.join "\n" # => "RGB\nGBR\nRBG", "RGBR\nBRGG\nGRBB\nRBGR" | |
end | |
end | |
puts Chessboard.new(3) # => nil | |
puts "" # => nil | |
puts Chessboard.new(4) # => nil | |
# >> RGB | |
# >> GBR | |
# >> RBG | |
# >> | |
# >> RGBR | |
# >> BRGG | |
# >> GRBB | |
# >> RBGR |
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