About Z-TreningZ-Trening is an online resource of challenging programming exercises (mostly compiled from previous international computer science competitions) that serves the purpose of training its users for future contests.
Each problem is accompanied by a series of tests that can be used to assess the correctness of a given solution. Users are free to submit their solutions in Pascal, C, or C++ and are graded based on the number of tests passed. Each user is associated with a history of his/her results and awarded medals.
Z-Trening also hosts online programming competitions, which are few hours long and include several new problems.
For additional information please read the short Tutorial and the FAQ or visit the website Forum.
Basically you know that Z-Trening rocks, hehe.