From: Lyndon Samson <lyndon.samson@...>
Date: 2005-10-17T10:38:38+09:00
Subject: Re: How to get non-unique elements from an array?

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Not very elegant, but a different approach...

bn =3D bn2 =3D 0
a.each {|el|(bn2 |=3D (1<<el) if (bn & ( 1<<el) ) !=3D 0) | bn |=3D (1<<el)=
 }
0.upto(a.length) { |bitNdx| puts bitNdx if (bn2 & ( 1<<bitNdx )) !=3D 0 }

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