Re:4Clojure hits 100K solved problems.
by tobij on Tuesday January 03, 2012 @07:14PM
(#3421997)
Take a look at http://projecteuler.net/problems It's a wonderful collection of non language specific mathematical and/or computer programming problems.
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Python challenge is interesting too, but not a good intro to the language.
http://www.pythonchallenge.com/
upon a cursory look I couldn't find a decent version for ruby, but there are many out there that do it differently.