Well, I made my better but it is not enough. I am happy to solve a part of this problem. Here my small contribution :
(I use special variable $, $/ and $; to minimize declaration)

sub LTR {
    # 116 characters
    my@a;for(@_){if(/\d/){push@a,$_}else{$/=pop@a;
    $,=join' ',pop@a,$_,$/;$,=~s/(.*)/($1)/ if((/[+-]/);push@a,$,;$;=$
+_}}@a
}
print LTR qw(1 2 - 3 4 + 5 * /);

[download]

My solution don't really minimize brackets :( (but seems to be correct most of the time; more brackets are better than less :))

Another problem is that I don't use %operator because it wasn't really helpful (without last change). So It can't solve Update #2 from Masem (I only see it now).

This problem is very tricky... When should we use brackets or not ???
Congratulation to chipmunk and MeowChow for their contributions.

BobiOne KenoBi ;)

In reply to Re: (Golf) Reversing RPN Notation by bobione
in thread (Golf) Reversing RPN Notation by Masem

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.