This has fewer lines:

if($l<$k){ if($s_rev[$d+1]==0 && $k-2>0){$s_rev[$d+1] = $k-2; } $h=$s[
+$b] == 0 ? 0 : $s[$b]-1;
$s[$b1] = max($k,$lt); ....

[download]

I suspect -- no, know damn well -- that it's not helpful. However, the fact is, since I'm in no position to guess what your inputs are like, nor to intuit your actual goal, ...well, it's the best I can do for now.

Please, update with more details (data sample, narrative intent)!

In reply to Re: reducing the number of lines by ww
in thread reducing the number of lines by baxy77bax

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