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iData是由北京大学、清华大学、浙江大学、复旦大学等师生学者共同筹建的用于教学、科研目的的公益互联网项目，旨在促进知识的传播和最新学术科技的共享。iData平台上所有信息均为公开发表的学术文献，由学者自由上传，并提供有限的免费浏览、下载服务。
Codeforces. Programming competitions and contests, programming community Codeforces 是一家总部位于俄罗斯的竞赛编程网站，它会定期举办在线比赛，并且竞赛选手是世界上一些最优秀的程序员。他们的挑战通常需要用到高等数学和算法，如果你是一个编程新手，他们的挑战很可能对你来说难度比较大。
CodinGame is a challenge-based training platform for programmers where you can play with the hottest programming topics. Solve games, code AI bots, learn from your peers, have fun.
CodeSignal is the leading technical interview solution, helping talent acquisition and engineering teams #GoBeyondResumes to hire high-quality and diverse technical talent. Use CodeSignal's skills evaluation frameworks to tap into underrepresented pools of candidates, save valuable engineering resources, increase speed-to-hire, and increase candidate pipeline yield.
A coding practice website for all programming levels – Join a community of over 3 million developers and improve your coding skills in over 55 programming languages!Codewars - Achieve mastery through coding practice and developer mentorship
Improve your coding skills with our library of 300+ challenges and prepare for coding interviews with content from leading technology companies.Coderbyte 提供了200多种编程挑战。在这里，你可以：使用10种编程语言中的一种进行在线挑战。看到网站发布的大多数挑战的官方解决方案。查看该网站其他80万用户为同一挑战提供的解决方案。
A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.
Powerful coding training system. LintCode has the most interview problems covering Google, Facebook, Linkedin, Amazon, Microsoft and so on. We provide Chinese and English versions for coders around the world.
