impl

sf.gg
https://segmentfault.com/u/aidegaobai/questions
https://segmentfault.com/u/ukzq/questions
github
https://github.com/moocstudent
https://github.com/moocstudent/ole-collections
other
https://bugstack.cn
tasksaas
http://8.136.81.58:3000/
codewars
https://www.codewars.com/users/g04-ukyo/badges
math
https://gitee.com/createmaker/python-math