add CTFtime to problem-sets-competitive-programming.md (#3468)

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rndd-AK 2019-12-11 16:33:50 +03:00 committed by Eric Hellman
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* [Competitive Programming](#competitive-programming)
* [Data science](#data-science)
* [Information security](#information-security)
* [Problem Sets](#problem-sets)
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* [Kaggle](https://www.kaggle.com)
### Information security
* [CTFtime](https://ctftime.org)
### Problem Sets
* [500 Data structures and algorithms interview questions and their solutions in C++](https://techiedelight.quora.com/500-Data-structures-and-algorithms-interview-questions-and-their-solutions-in-C%2B%2B)