|Pathologically Eclectic Rubbish Lister|
Algorithm for cancelling common factors between two lists of multiplicandsby BrowserUk (Pope)
|on Aug 08, 2005 at 19:33 UTC||Need Help??|
BrowserUk has asked for the
wisdom of the Perl Monks concerning the following question:
Given 2 arrays of numbers, I want an efficient algorithm for "cancelling out". (There is probably a proper name for this, but I don't know it).
Most easily described by example. Given:
I want to cancel values between the arrays to end up with:
Note. This is a trivial example. Both the sizes of the arrays and the values will be much larger.
Update: This is not the elimination of duplicates or intersection of arrays. Once any duplicates have been eliminated, it then becomes a task of reducing factors from @a & @b unil no further factors can be removed.
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