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Perl: the Markov chain saw

Re: Finding longest palindrome from a string

by Random_Walk (Prior)
on Aug 13, 2004 at 09:29 UTC ( #382586=note: print w/replies, xml ) Need Help??

in reply to Finding longest palindrome from a string

Nice puzzle, I offer my humble attempt
sub Random_Walk { my ($left, $right, $pal, $i)=("", "", "", 1); my $test=join " ", @ARGV; for (; $i<((length $test)/2)+2; $i++) { $left.="(.)"; $right="(\\$i)".$right; if ($test=~/$left.?$right/) {$pal=$&; next} return $pal; } }
I tried a recursive one first which was fun but I had to do lots of work to cut the string into different slices so regex it is.

cnn, Thanks for the hint on code blanking.

Off by two error fixed in the for loop

Added .? in the middle to allow palindromes symetrical around a single character (borrowed that idea from ccn ;)

Replies are listed 'Best First'.
Re^2: Finding longest palindrome from a string
by ccn (Vicar) on Aug 13, 2004 at 09:32 UTC
    I do not know how to black the code out

    You can use

    <table><tr><td bgcolor="#000000" color="#000000"> [[[ YOUR CODE HERE ]]] </td></tr></table>

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[choroba]: Yes, sometimes missing ; after the use clause just interprets the next line somehow and passes the result to the used module which could happily ignore it. Been there, seen that.
[Discipulus]: luckly the program was 20 lines!

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