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67

answers:

3

Some time ago, I have heard about the Netflix challenge to find a better way to organize recommendations. Do you know about more "challenges" in computer science? What are the prizes?

+1  A: 

DreamInCode.net does something called 52 weeks of code, each week picking some new type of challenge.

Nix
A: 

I you are a student you have the ICPC.

daramarak
+1  A: 

You can also use topcoder.com and innocentive.com.

-Brajesh

Brajesh