From: Aldric Giacomoni <aldric@...>
Date: 2010-04-06T22:05:35+09:00
Subject: Re: Find a set of common elements from a multi-dimensional array

Shreyas Satish wrote:
> I have a multi-dimensional array ; a=[[2,3,4],[1,3,4],[1,2],[1,2,3,4]]
> i've to compare all the 4 sub-arrays and get common elements.Next,take 3
> subarrays at a time and get common elements.then take 2 sub arrays at a
> time and get common elements.

Well, the way to get common elements between arrays is with the 
"intersection" method: 
http://ruby-doc.org/core/classes/Array.html#M002212 (of course, 
available as a Set operation too: 
http://ruby-doc.org/core/classes/Set.html#M001621)

And what you're looking for is a brute-force way to compare all subsets 
of all possible sizes with other subsets of the same size. I'll leave 
that one as an exercise.
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