03.rb

# frozen_string_literal: true

ITEM_TYPES = [*('a'..'z'), *('A'..'Z')].to_a.freeze

def item_type_priority(item_type)
  ITEM_TYPES.index(item_type) + 1
end

def sum_of_priorities(item_types)
  item_types.map { |x| item_type_priority(x) }.sum
end

common_item_types = []
rucksacks = []

DATA.each_line(chomp: true) do |rucksack_str|
  rucksack_ary = rucksack_str.chars
  rucksacks << rucksack_ary

  a, b = rucksack_ary.each_slice(rucksack_ary.size / 2).to_a
  item_type = a.intersection(b).first

  common_item_types << item_type
end

badges = rucksacks.each_slice(3).map { |(a, b, c)| a.intersection(b, c).first }

puts "part 1: #{sum_of_priorities(common_item_types)}"
puts "part 2: #{sum_of_priorities(badges)}"

__END__
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