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@@ -49,6 +49,7 @@
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* [Google Code Jam - Practise](https://code.google.com/codejam/contests.html)
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* [Hacker.org](http://www.hacker.org)
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* [HackerEarth](https://www.hackerearth.com)
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+* [HDU Online Judge](http://acm.hdu.edu.cn)
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* [InterviewBit](https://www.interviewbit.com)
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* [Leetcode](https://leetcode.com)
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* [Mathproblem of the Month - Bilkent University](http://www.fen.bilkent.edu.tr/~cvmath/prob-month.html)
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Victor Felder