aoc2025/day_05/1.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

class Main
  def run
    ranges = []
    ingredient_ids = Hash.new(0)
    $stdin.each_line do |line|
      arr = line.chomp.split("-").map(&:to_i)
      if arr.size == 2
        ranges << (arr[0]..arr[1])
      elsif arr.size == 1
        ingredient_ids[arr[0]] += 1
      end
    end

    @sum = 0
    ingredient_ids.each do |id, count|
      if ranges.any? { |r| r.include?(id) }
        @sum += count
      end
    end

    puts @sum
  end
end

Main.new.run