AtCoder lanking

ac_lank.rb

# encoding : utf-8
# usdge : ruby ac_lank.rb num user_name
# example : ruby ac_lank.rb 002 takkaw 
require 'nokogiri'
require 'open-uri'

arc = ARGV.shift.to_i
url = "http://arc%03d.contest.atcoder.jp/standings/" % arc 
user = "/users/" + ARGV.shift

xpath = "//div[@id='outer-inner' and @class='container']/table[@class='table table-bordered table-striped']"

25.times { |t| 
  doc = Nokogiri::HTML(open(url + (t+1).to_s))
  users = doc.xpath(xpath)[0].xpath(".//td/a")
  users.each_with_index { |td,i|
    if td[:href] == user
      puts t*20 + i + 1 
      exit
    end 
  }
}