Here's mine. Not particularly interesting, really, and probably
missing out on a few standard golf tricks.
sub c {my(@a,%h,$i)=split//,pop;my$s=pop;$s=~s!(.)!$h{$1}||=$a[$i++]!g
+e;$s}
67 chars.
Update: got rid of one character by using substr:
sub c {my($a,%h,$i)=pop;my$s=pop;$s=~s!(.)!$h{$1}||=substr$a,$i++,1!ge
+;$s}
66 chars.
Update 2: if you don't need strict:
sub c {($s,$a)=@_;my(%h,$i);$s=~s!(.)!$h{$1}||=substr$a,$i++,1!ge;$s}
61.
Update 3: Oh, and the reason I'm still initializing %h
and $i is so that the sub will work on repeated invocations.
If we don't *have* to do that, this will do:
sub c {($s,$a)=@_;$s=~s!(.)!$h{$1}||=substr$a,$i++,1!ge;$s}
51.
Update 4: Use $_:
sub c {($_,$a)=@_;s!(.)!$h{$1}||=substr$a,$i++,1!ge;$_}
47.
Update 5: Okay, so none of these actually *work*
per the spec. Thanks, tilly. :)
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