This is slightly off-topic, but just for your information, there is a description of the heap algorithm in the book Mastering Algorithms with Perl (O'Reilly, by Jon Orwant, Jarkko Hietaniemi, and John Macdonald). I think that the authors wrote a module (probably aimed at pedagogical purposes more than production) going with the book; but I'm not at home and can't check the book's content today, and I don't know if that particular algorithm is in this module.

My book on Perl 6 also has something on heaps, but this is getting even more OT.

In reply to Re^2: Minimally changing combinations (updated!) by Laurent_R
in thread Minimally changing combinations by Yary

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