hihoCoder

CodeChef - Learn and Practice Coding with Problems

Virtual Judge(OJ集中营,汇聚了大多数优秀的OJ)

UOJ - Universal Online Judge

HackerRank is the market-leading coding test and interview solution for hiring developers. Start hiring at the pace of innovation!

备战技术面试？力扣提供海量技术面试资源，帮助你高效提升编程技能，轻松拿下世界 IT 名企 Dream Offer。

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.

CodeHS - Teach Coding and Computer Science at Your School | CodeHS

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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!

趣IT——互联网在线刷题学习平台，汇集互联网大厂面试真题，拥有java、C++、Python、前端、产品经理、软件测试、新媒体运营等多个热门IT岗位面试笔试题库，提供能力测评、面试刷题、笔试刷题、程序员刷题、面试经验分享、IT技术交流、实习内推等服务，求职刷题就来互联网求职刷题神器趣IT（www.funit.cn）！

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.

【赛码网】在线考试系统、在线面试系统-易用稳定专业

洛谷创办于2013年，致力于为参加noip、noi、acm的选手提供清爽、快捷的编程体验。它拥有在线测题系统、强大的社区、在线学习功能。很多教程内容由各位oiers提供的，内容广泛。无论...