1D Packing Problem - Recursive Solution

carousel.rb

class Carousel
  @@rectangles = [1]*5 + [2]*5 + [3]*5 + [4]*5 + [5]*5

  attr_accessor :carousel

  def initialize(total_size)
    @carousel = []
    fill_carousel(total_size, @carousel)
  end

  def get_rand_rectangle(size)
    return @@rectangles.select{|r| r <= size}.sample
  end

  def fill_carousel(total_size, carousel)
    room_left = total_size - carousel.inject(0, :+)

    if room_left <= 0
      return carousel
    else
      carousel << get_rand_rectangle(room_left)
      fill_carousel(total_size, carousel)
    end
  end
end

Carousel.new(5).carousel