rankk get solve numbers

#!/usr/bin/env ruby

require "httparty"
require "nokogiri"

$stdout.sync = true

class ChallengesSolves
  def initialize
    @root = Nokogiri::HTML(HTTParty.get("https://www.rankk.org/"))
    @levels = @root.css("#hofs > ul > li").flat_map do |level|
      group = level.css("img")[0]["alt"][/\d+/]
      level.css("li a").map{|a| ["#{group}/#{a.text}", a["href"]] }
    end.to_h
  end

  def call
    @levels.each do |id, path|
      doc = Nokogiri::HTML(HTTParty.get("https://www.rankk.org#{path}"))
      solves = doc.css("td.td")[0].text
      puts [id, solves].join("\t")
    end
  end
end

ChallengesSolves.new.call