Here they are, based on our statistics of running close to 40,000 coding challenges in 2011. CodeEval developers spent 2.3 years straight - hacking on code and completing challenges. You guys rock, here's to the developers and a rocking 2012.
CodeEval is a screening / sourcing platform for auto evaluation of programming challenges. It can be used by employers to screen / source technical candidates and also by freelancers/developers to sharpen their skills by competing with their peers.
Visit us at www.codeeval.com