hash

Encoding.default_external = 'utf-8'
Encoding.default_internal = 'utf-8'
path = ARGV.first
# ids = [1, 3 ...]

map = Hash.new

def get_user_id(line)
  return (line.match /\d*$/).to_s
end

File.open(path, "r") do |f|
  f.each_line do |line|
    id = get_user_id(line)
    next if id.to_i == 0
    # next if id.to_i == 0 or not ids.include? id
    map[id] = Array.new if map[id].nil?
    map[id].push line
    puts "id: #{id}, length: #{map[id].length}" if map[id].length > 100
  end
end

puts map[34428]