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I'd add TopCoder and Codeforces to the list: http://community.topcoder.com/tc http://community.topcoder.com/tc http://codeforces.com/ http://codeforces.com/

by nabb 15y ago

I'd add TopCoder and Codeforces to the list: http://community.topcoder.com/tc http://community.topcoder.com/tc http://codeforces.com/ http://codeforces.com/ Both of these sites run a few algorithm competitions every month.