aoc-2022/4.rb

require 'set'

@input = File.read("4.input").split("\n")

def set_from_range(range)
  (from, to) = range.split("-")
  return Set.new((from.to_i..to.to_i).to_a)
end

score_1 = 0
score_2 = 0

@input.each do |line|
  (left, right) = line.split(",")

  left = set_from_range(left)
  right = set_from_range(right)

  if left.subset?(right) or right.subset?(left) then
    score_1 += 1
  end

  if left.intersect?(right) then
    score_2 += 1
  end
end

puts score_1
puts score_2