### Index
* [Competitive Programming](#competitive-programming)
* [Data science](#data-science)
* [Problem Sets](#problem-sets)
### Competitive Programming
* [4Clojure](http://www.4clojure.com)
* [A2 Online Judge](https://a2oj.com)
* [Caribbean Online Judge](http://coj.uci.cu)
* [Codeabbey](http://www.codeabbey.com)
* [Codechef](https://www.codechef.com/contests)
* [Codecombat](https://codecombat.com)
* [Codeeval](https://www.codeeval.com)
* [CodeFights](https://codefights.com)
* [Codeforces](http://codeforces.com/contests)
* [Coderbyte](https://coderbyte.com)
* [Codewars](http://www.codewars.com)
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