[第二轮] 3/25-3/31 CareerCup 6.1

You have 20 bottles of pills, 19 bottles have 1.0 gram pills, but one has pills of weight 1.1 gram. Given a scale that provides an exact measurement, how would you find the heavy bottle? You can only use the scale once.

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http://www.1point3acres.com/bbs/thread-48094-1-1.html
http://www.1point3acres.com/bbs/thread-32423-1-1.html

https://gist.github.com/Jnight/5268884