Solving problems from different contests, courses and fields.
Some solutions may be very old or in inconsistent state because this repo was created just for my own fun and I just don't want to loose some of these codes. :)

CodeEval - C++, Python, Java.
Project Euler - Python.
Codeforces - C++.
TopCoder - C++.
Timus - Java.
Algo-class Stanford - C++.
Google Code Jam - C++.
A couple of classic concurrency problems - Java.