added more links to information security (#3961)

* Update problem-sets-competitive-programming.md

* Update problem-sets-competitive-programming.md

* Update problem-sets-competitive-programming.md

* alphabetize

Co-authored-by: Eric Hellman <eric@hellman.net>
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Aman Rawat 2020-11-06 23:38:50 +05:30 committed by GitHub
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@ -62,6 +62,8 @@
* [ångstromCTF](https://angstromctf.com)
* [CTFtime](https://ctftime.org)
* [Hacker101](https://ctf.hacker101.com)
* [InCTF](https://inctf.in)
### Problem Sets