Here is what I mean by commified. Consider the following 2 versions of the same map statement: 
...map{"@$_\n"}@a...
...map"@$_\n",@a...

[download]
The first form is more general, you can put more complex logic inside the block. The second form replaces the block with a comma and shaves a character. Often you can shave a few characters off of someone's solution by seeing that a few map's or grep's can switch over to the version with the comma.

Sometimes it is not obvious that you can. So sometimes I just have to try it out. As in the case: 

...map{$$_[0]>$i?():[$i,@$_]}P($n-$i)...
...map$$_[0]>$i?():[$i,@$_],P($n-$i)...

[download]
Incidentally the following version is the same size, but has slightly nicer (IMHO) output: 
sub P{
my$i=pop;[$i],map{--$i;map$$_[0]>$i?():[$i,@$_],P($_-1)}2..$i
}

[download]

In reply to Re (tilly) 6: (Golf as well): List of Partitions by tilly
in thread (Golf as well): List of Partitions by jynx

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.