json.top_data do
  json.passed_count @pass_count
  json.simple_count @simple_count
  json.medium_count @medium_count
  json.diff_count @diff_count
end

json.hacks_count @hacks_count
json.hacks_list do
  json.array! @hacks do |hack|
    json.(hack,:identifier, :name , :hack_user_lastest_codes_count, :difficult, :passed_rate, :category, :open_or_not, :status)
  end
end