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Codewars is where developers achieve code mastery through challenge. Train on kata in the dojo and reach your highest potential.

求职之前，先上牛客，就业找工作一站解决。互联网IT技术/产品/运营/硬件/汽车机械制造/金融/财务管理/审计/银行/市场营销/地产/快消/管培生等等专业技能学习/备考/求职神器，在线进行企业校招实习笔试面试真题模拟考试练习,全面提升求职竞争力，找到好工作，拿到好offer。

Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview.

Topcoder is home to the world’s largest community of designers, developers, and data scientists. Allowing you the freedom to start and execute faster.

Welcome To PKU JudgeOnline

VisuAlgo was conceptualised in 2011 by Dr Steven Halim as a tool to help his students better understand data structures and algorithms, by allowing them to learn the basics on their own and at their own pace. Together with his students from the National University of Singapore, a series of visualisations were developed and consolidated, from simple sorting algorithms to complex graph data structures. Though specifically designed for the use of NUS students taking various data structure and algorithm classes (CS1010, CS1020, CS2010, CS2020, and CS3233), as advocators of online learning, we hope that curious minds around the world will find these visualisations useful as well.