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Have you heard of TopCoder ( http://www.topcoder.com/tc ) ? They run several algorithm competitions like this every month.

Yeah. I've been practicing on topcoder and another, lesser known site, called codeforces.

Codeforces is run by this dude [http://petr-mitrichev.blogspot.com/] who is the #1 ranked algorithms programmer on TC. Pretty cool!