Shelf Tidying

 The Problem:

 The twenty volumes of Star Trek videos are slightly out of order…and it’s your job to tidy them up. 

We’ll count “taking a video off the shelf, pushing some of the others to one side, and putting the first video back onto the shelf” as a single move that takes about, say, 5 seconds. 

What is the quickest time you could get these twenty volumes back into their correct order, reading 1 to 20 from left to right? 

Can you prove it’s the quickest time possible?


Open the File as a Word Document


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Last modified: June 18, 2007