Update problem-sets-competitive-programming.md (#6022)

3 years ago · 47f785e575
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 * [A2 Online Judge](https://a2oj.com/ps)
 * [Advent Of Code](http://adventofcode.com)
 * [Anarchy Golf](http://golf.shinh.org)
+* [BaekJoon Online Judge](http://www.acmicpc.net)
 * [CareerCup](http://www.careercup.com)
 * [CheckIO](http://www.checkio.org)
 * [Codechef](https://www.codechef.com/problems/school)