In article <[EMAIL PROTECTED]>,
 "Xah Lee" <[EMAIL PROTECTED]> wrote:

> a absolute requirement in this problem is to minimize the number of
> comparison made between files. This is a part of the spec.

You need do no comparisons between files.  Just use a sufficiently 
strong hash algorithm (SHA-256 maybe?) and compare the hashes.

-- 
David Eppstein
Computer Science Dept., Univ. of California, Irvine
http://www.ics.uci.edu/~eppstein/
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