Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW
 
PerlMonks  

Re: Finding longest palindrome from a string

by BrowserUk (Pope)
on Aug 13, 2004 at 12:57 UTC ( #382644=note: print w/ replies, xml ) Need Help??


in reply to Finding longest palindrome from a string

#! 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


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


Comment on Re: Finding longest palindrome from a string
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://382644]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (15)
As of 2015-07-06 13:33 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (74 votes), past polls