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Re: (Golf) Per Mutations

by Masem (Monsignor)
on May 04, 2001 at 03:03 UTC ( #77830=note: print w/ replies, xml ) Need Help??

in reply to (Golf) Per Mutations


#!/usr/bin/perl -w use strict; use Data::Dumper; my @b = p(1,2,3,4); print Dumper( @b ); sub p { $#_<1?[@_]:map{my$a=$_;map{[$a,@$_]}p(grep{$_!=$a}@_)}@_ }

Dr. Michael K. Neylon - || "You've left the lens cap of your mind on again, Pinky" - The Brain

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Re (tilly) 2: (Golf) Per Mutations
by tilly (Archbishop) on May 04, 2001 at 04:29 UTC
    Didn't the rules say arbitrary list? Try this with the list (1,2,3,1) and you get incorrect output.

    However here is another 57 char solution that does not suffer from this deficiency.

    sub p{ @_?map{my$x=shift;@r=map[$x,@$_],&p;push@_,$x;@r}1..@_:[] }
Re: Re: (Golf) Per Mutations
by MeowChow (Vicar) on May 04, 2001 at 03:46 UTC
    Awesome :) We can even bring that down to 49:
    sub p { @_?map{my$a=$_;map[$a,@$_],p(grep$_!=$a,@_)}@_:[] }
                   s aamecha.s a..a\u$&owag.print
      Make that 48:
      sub p { @_?map{my$a=$_;map[$a,@$_],p(grep$_^$a,@_)}@_:[] }

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