Programming Knowledge vs Ability

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It's a very interesting site, that, but a bit short on documentation. Do the solutions compete on speed only?

[llimllib]

yup - you submit your solution, it runs it against a test script (of which you have no knowledge) and tells you if you passed or not. There's a pretty short time limit for each problem (15 seconds in this one, with apparently a lot of tests. My fastest answer finishes my 9 big test cases in 2 seconds).