Try http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8 http://uva.onlinejudge.org/index.php?option=com_onlinejudge&... (UVa Online Problem Set

Try http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8 http://uva.onlinejudge.org/index.php?option=com_onlinejudge&... (UVa Online Problem Set Judge). That used to be the ACM Valladolid Online Judge, but at some point they changed servers. This one's more intended for high school folks (hadn't touched them since then), but try out USACO's training website. Anybody can sign up and do problems. http://train.usaco.org/usacogate http://train.usaco.org/usacogate Both of these sites test your algorithmic knowledge, too, but that's always nice to brush up on anyway.