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Re: Re: Detecting transpositions

by Cine (Friar)
on Aug 06, 2003 at 15:45 UTC ( #281453=note: print w/replies, xml ) Need Help??


in reply to Re: Detecting transpositions
in thread Detecting transpositions

Or even shorter... Albeit about 3 times slower on long strings and 30% faster for short...
sub comp { local $_ = $_[0] ^ $_[1]; return s/([^\x00])\1//g==1 && !tr/\x00/1/c; }


T I M T O W T D I

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Re: Detecting transpositions
by Abigail-II (Bishop) on Aug 06, 2003 at 15:52 UTC
    That doesn't return the index of where the transposition happens, does it?

    Abigail

      So here it is with bonus, just a little longer... And now, its just a little faster than yours. Except on large identical strings where it is 3 times faster because of the first line. Without it the regexp would perform very slow.
      sub comp { return -1 if $_[0] eq $_[1]; local $_ = $_[0] ^ $_[1]; /^([\x00]*)([^\x00])\2[\x00]*$/; $1 ? length$1 : -1; }


      T I M T O W T D I
      No, that was only a bonus ;)

      T I M T O W T D I

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