Like a number of others in the monastery, I would suggest you not use Heap. This may be one of those rare cases where it's faster and more reliable to write and debug your own version than go to CPAN. Alternatively, the authors of "Elements of Programming with Perl" have been kind enough to put a kinder, gentler implementation on the web. I haven't tested it, but it's at least simple enough that it's possible to read and understand the code, and relatively painless to use it.

/s

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