json.hack do
  json.(@hack, :difficult, :time_limit, :description, :score, :identifier)
  json.language @hack.language
  json.username @hack.user.real_name
  json.code @my_hack.code
  json.pass_count @hack.pass_num
  json.submit_count @hack.submit_num
end

json.test_case do
  json.input @hack.input_test_case
end