links
http://icpcres.ecs.baylor.edu/onlinejudge/
UVa Online Judge sitehttp://icpc.baylor.edu/
Official International Collegiate Programming Contest (ACM) sitehttp://www.oi.edu.pl/
Polish Olympiad in Informaticshttp://www.soi.ch/
Swiss Olympiad in Informaticshttp://acmsolver.org/
ACM-ICPC International Collegiate Programming Contest Training Web Sitehttp://ipsc.ksp.sk/
Internet Problem Solving Contest - Comenius Universityhttp://www.cs.uleth.ca/~cheng/icpc.html
ACM Programming Contest at Lethbridgehttp://www.informatik.uni-ulm.de/acm/
ACM Programming Contest at the University of Ulmhttp://get-me.to/oi/
Homepage of Zeyuan Zhu, devoted to programming contests