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Online Judge and Programming Contests

http://icpc.baylor.edu/icpc/ - Official ACM ICPC site
http://acm.uva.es/ - University de Valladolid (UVA) Online Judge
http://acm.timus.ru/ - Ural State University (USU) Online Judge
http;//acm.sgu.ru/ - Saratov State University (SSU) Online Judge
http://acm.zju.edu.cn/ - ZheJiang University (ZJU) Online Judge
http://www.usaco.org/ - USA Computing Olympiad (USACO) Training System
http://ipsc.ksp.sk/ - Comenius University Programming Contests
http://www.topcoder.com/ - Computer Programming Competition


Programming + Algorithm

http://www.felix-halim.net/
Felix Halim Programming Website. Contains useful PHP script to view UVA OJ rank list, next 20 easiest problem, statistic comparer, and several solutions for UVA OJ.

http://www.comp.nus.edu.sg/~stevenha/
Steven Halim Programming Website. Contains a lot of hints for UVA problems and many useful algorithms.

http://www.ioiforum.org/
Useful forum for discussing IOI problems, UVA OJ, SSU OJ and other programming problems.

http://www.acmsolver.org/
Contains many problem solving tips for UVA and programming tutorials.

http://www.acmbeginner.tk/
This site is for helping the novice programmer who practice on acm.uva.es site with C/C++ language. Here you found problem related tricks, critical input output of problems of the acm.uva.es site and lot of programming related links.