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https://codefights.com

Fight against the code bot in a series of 3 challenges. I'd be interested to know how the bot figures out how to code a particular problem to make this even remotely fair.

I got a perfect score so far on the first challenge, pretty easy. Instructions for each challenge seem well written and straight forward. You are given time to view the problem before you begin coding, but the problem is also displayed while you code. You can choose your language and I think even change it during the problem. There are even a few options for the editor, such as code completion and your choice of sublime, VI, or emacs.

I think it's pretty neat. My second challenge is about sliding window compression on a string. I haven't completed it yet, I'm a noob with compression.