#!/usr/bin/env ruby

require_relative '../common'

class Day04 < Day
  def part1
    stdin.map do |pair|
      pair.split(',').map { |elve| first, last = elve.split('-'); first.to_i..last.to_i }
    end.select do |pair|
      pair.first.cover?(pair.last) || pair.last.cover?(pair.first)
    end.size
  end

  def part2
    stdin.map do |pair|
      pair.split(',').map { |elve| first, last = elve.split('-'); first.to_i..last.to_i }
    end.select do |pair|
      pair.first.include?(pair.last.first) || pair.first.include?(pair.last.last) ||
        pair.last.include?(pair.first.first) || pair.last.include?(pair.first.last)
    end.size
  end
end

Day04.run