training websites

Hi, here are some coding websites with problems for training:

www.spoj.pl
www.codeforces.com
www.codechef.com
www.usaco.org



if anyone has more websites, please write them here.
onlinejudge.org
www.programming-challenges.com

Damn, forgot about google code jam.
Last edited on
It looks like you are the only two who are such trained.:)
@vlad:
how do you train?
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