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CodeFights is the most fun way to practice your programming skills.
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LeetCode is a platform for preparing technical coding interviews. Pick from an expanding library of more than 450 questions, code and submit your solution to see if you have solved it correctly. It is that easy!
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.