Hello Monks, Looking for any improvements within my code to find the largest palindrome number using product of any 3 dight numbers .There is another algorithm using recursion which I would be trying , But wanted to check for any improvisations using of the method of finding the product and then reversing the digits to check for the palindrome.

#!/usr/bin/perl
use warnings;
use strict;
use Data::Dumper;
########

sub three_digit_prodcuts {
    my @products = ();
    my $i = 999;
    my $counter = 999;
    while ($i >= 100 ) {
      my $product = $i * $counter;
      push @products, $product;
      $counter--;
      if ($counter >= 100) {
          redo;
      }else {
          $counter = $i - 1;
          $i--;
          next;
      }
    }

      return \@products;
}

my $pr =  three_digit_prodcuts;
my @arr = ();
foreach my $n (@$pr) {
    my $rev = join '', reverse(split //, $n);
    if ($n == $rev) {
        push @arr, $n;
        next;
    }
}

my $largest =  ( sort { $b <=> $a } @arr)[0];
print "$largest\n";

$ time ./largest_3_digit_product_palindrome.pl
906609

real    0m0.633s
user    0m0.614s
sys    0m0.018s

[download]

In reply to Largest palindrome number for a 3 digit product of 2 numbers by pr33

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.