Follow up old PRs (#4008)

* Add "What I Wish I Knew When Learning Haskell"

Follow up #3173.

* Update free-programming-books-zh.md

Follow up #3330.

* added competitive programming link

Follow up #3398.
This commit is contained in:
Ku Lok Sun
2020-10-13 15:49:52 +02:00
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parent d366a40253
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@ -21,6 +21,7 @@
* [Codewars](http://www.codewars.com)
* [Codingame](https://www.codingame.com/start)
* [Facebook Hackercup](https://www.facebook.com/hackercup)
* [Google Code Jam](https://codingcompetitions.withgoogle.com/codejam)
* [HackerEarth](https://www.hackerearth.com)
* [Hackerrank](https://www.hackerrank.com)
* [Internet Problem Solving Contest](http://ipsc.ksp.sk)