I also implemented the wiki pseudo-code, resulting almost identical code:

<Reveal this spoiler or all in this thread>

Though I pass the data in via a reference for efficiency.

I've been trying to wrap my brain around the mentioned Knuth optimisation without success.

One comment on your code. This return wantarray ? @S : [@S]; throws away the advantage of returning a reference, by constructing a list from the existing array, which is then used to construct another (anonymous) array, a reference to which is returned.

Better to just do return wantarray ? @S : \@S;

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In reply to Re^8: Longest Increasing Subset by BrowserUk
in thread Longest Increasing Subset by gilthoniel

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