I believe this would still be O(2n). Even if Digest::MD5::md5 is really written in C, so it might be FASTER, but it's the same amount of work. i.e. you are still running through each element of both arrays.

In reply to Re^2: Fast way to check if a sort was doen by archfool
in thread Fast way to check if a sort was doen by Outaspace

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