day 5 (1 and 2)

day5.rb

values = File.read('input2.txt')

def binary(range, rows, mLetter='F')
  mid = (range.last - range.first) / 2.0

  return rows.first.match(/F|L/) ? range.first : range.last if rows.count == 1

  letter = rows.shift
  letter == mLetter ? binary((range.first..(range.first + mid.floor)), rows, mLetter) : binary(((range.first + mid.ceil)..range.end), rows, mLetter)
end

a = values.split(/\n/).map do |line|
  value = line.split(//)
  (binary((0..127), value.first(7)) * 8) + binary((0..7), value.last(3), 'L')
end

puts (a.sort.first..a.sort.last).to_a - a

day_6.rb

values = File.read('input2.txt')

a = values.split(/\n\n/).map do |all_groups|
  group = all_groups.split(/\n/).map {|p| p.split(//) }

  f = group.first
  f.select { |a| group.all? { |per| per.include?(a) } }.count
end.sum

puts a

day_7.rb

def bag_holder(type, bag_rule)
  can_hold_gold = bag_rule.match(/^(\w+ \w+) .* \d+ #{type}/)&.captures
end

def get_bags(type, found=[], belongs_to='')
  found << type
  bags = values2.split(/\n/).map do |bag_rule|
    bag_holder(type, bag_rule)
  end.compact.flatten
  (bags - found).flat_map do |bag|
    get_bags(bag, found, type)
  end

  found
end

puts (get_bags('shiny gold') - ['shiny gold']).uniq