I'll third this! Brent's class on the art of recursion really taught me quite a lot about how to think about problems in a different way. http://www.cis.upenn.

I'll third this! Brent's class on the art of recursion really taught me quite a lot about how to think about problems in a different way. http://www.cis.upenn.edu/~cis39903 http://www.cis.upenn.edu/~cis39903