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* [Hacker.org](http://www.hacker.org)
* [HackerEarth](https://www.hackerearth.com)
* [HDU Online Judge](http://acm.hdu.edu.cn)
* [Interactive Coding Challenge](https://github.com/donnemartin/interactive-coding-challenges)
* [InterviewBit](https://www.interviewbit.com)
* [Kattis](https://open.kattis.com)
* [Leetcode](https://leetcode.com)