I like to find all possible unique 'integer squares' from a given number. (starting with 0 doesn't count). Increasing the value of MAX_NUMBER in following code makes program slower. Looking for faster ways to do it. 

use strict;
my $SQUARE;
my $MAX_NUMBER = 1000;
foreach my $number (4..$MAX_NUMBER){
    my $square  = $number * $number;
    $SQUARE->{$square} = 1;
}
my $string = q(59738219024971503664);
my $total_length;
foreach my $square (keys %{$SQUARE}){
    if($string =~ /$square/){
    my $length =  length($square);
    $total_length  += $length;
    print "$square\t$length\t$total_length\n";
    }
}

[download]
The whole idea is to find the $string of n characters to maximize the $total_length.

In reply to Finding string for patterns by artist

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.