Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change
 
PerlMonks  

comment on
( #3333=superdoc: print w/replies, xml ) Need Help?? 

#! perl -slw
use strict;

sub buk {
    my $string = shift;
    my @pals;
    while( $string =~ m[(.) (?=( (?:\1) | (?:.\1) ) ) ]gx ){
        my( $left, $right ) = ( $-[ 0 ], $+[ -1 ] );

        while( $left and $right < length( $string )
        and substr( $string, $left, 1 ) eq substr( $string, $right, 1 
+)
        ) { 
            $left--; $right++ ;
        }
        my $pal = substr( $string, $left, $right - $left );

        if( !@pals or length( $pals[ -1 ] ) < length( $pal ) ) {
            @pals = $pal;
        } 
        else {
            push @pals, $pal unless @pals;
        }
    }
    return wantarray ? $pals[ 0 ] : @pals;
}

print $ARGV[ 0 ];
print ' ' x index( $ARGV[ 0 ], $_ ), $_ for buk $ARGV[ 0 ];

__END__
P:\test>382567 1111111121111111111112111111111111111111111112111111111
+111211111
1111111121111111111112111111111111111111111112111111111111211111
  11111121111111111112111111111111111111111112111111111111211111

P:\test>382567 1111111121111111111112111111111111111111111112111111111
+1121111
11111111211111111111121111111111111111111111121111111111121111
         111111111111211111111111111111111111211111111111

[download]

Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon

In reply to Re: Finding longest palindrome from a string by BrowserUk
in thread Finding longest palindrome from a string by BUU

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, 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, 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.
    • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others cooling their heels in the Monastery: (3)
    As of 2021-04-21 02:48 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      No recent polls found
      Notices?