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1. Algorithms Algorithms Public

   Compilation of fast competitive programming algorithms

   C++

2. CodeChef CodeChef Public

   CodeChef solutions

   C++

3. LightOJ LightOJ Public

   LightOJ Practice Problems

   C++

4. TopCoder TopCoder Public

   SRM Problems

   C++

5. UVAJudge UVAJudge Public

   UVA Judge Problem Archive

   C++ 1

6. Arithmeknights Arithmeknights Public

   Roguelike but each room starts with a math phase, where you answer problems to gain power for the level.

   C++