Here is one of 68 characters in length:
sub p{my@x;map{my$c=$_;$_%$c||++$x[$_]for@_}@_=2..pop;grep$x[$_]==1,0.
+.$#x}
UPDATE: And another of 65:
sub p{@_=2..pop;my$c;while($_[$c]){@_=($_[$c],grep$_%$_[$c],@_);$c++}@
+_}
UPDATE: And another of 60:
sub p{@_=2..pop;my$c;@_=($_[$c++],grep$_%$_[$c-1],@_)while$c<@_;@_}
UPDATE: And another of 40 (but I fear it strays from the rules...):
sub p{grep{my$c=$_;$#_==grep$c%$_,@_}@_=2..pop}
japhy --
Perl and Regex Hacker
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
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<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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