availability_check.rb

#!/usr/bin/env ruby -wKU

puts '****************************************'
availability = (8..12)
puts "looking for availability in this interval:\n #{availability}"
puts '****************************************'
rb1 = (6..9)
puts rb1
rb2 = (10..11)
puts rb2
rb3 = (12..14)
puts rb3
puts '****************************************'
bookings = [rb1, rb2, rb3]

av = []
bookings.each do |b|
  if availability.include?(b.first)
    if availability.first != b.first && availability.last != b.last
      av << (availability.first..b.first)
      availability = (b.last..availability.last)
      next
    elsif availability.first == b.first && availability.last != b.last
      availability = (b.last..availability.last)
      next
    elsif availability.first != b.first && availability.last == b.last
      av << (availability.first..b.first)
      availability = (b.last..availability.last)
      next
    else
      break
    end
  elsif availability.include?(b.last)
    availability = (b.last..availability.last)
    next
  end
end

av << (bookings.last.last..availability.last) if bookings.last.last < availability.last
puts "Room available only in these houres:\n #{av.inspect}"
puts '****************************************'