If you're still interested, here are a few items you may wish to look at:

• perlreftut - Tutorial explaining the use of references in perl.
• Schwartzian Transform - Pre-compute expensive results before sorting.
• map, grep and sort help you to write idiomatic perl dealing with lists.

I'm pretty sure that the rest of the code I posted would be fairly familiar to most Java programmers.

-David

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