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### Re^2: Challenge: Generate fixed size combination across groups without duplicates

by Limbic~Region (Chancellor)
 on Nov 16, 2011 at 04:30 UTC ( #938310=note: print w/ replies, xml ) Need Help??

GrandFather,
Ah yes, recursion - that thing my brain finds so confusing. Thanks - this appears to be perfect.

Cheers - L~R

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Re^3: Challenge: Generate fixed size combination across groups without duplicates
by GrandFather (Sage) on Nov 16, 2011 at 05:17 UTC

The real trick is adding the "no-op" entry to each group.

True laziness is hard work
GrandFather,
No, I assure you that my brain does not think recursively. I have never encountered any other programmer or a math aficionado with this affliction. That makes it amazingly frustrating when people say - it is simple, just think of it as repeating a simple process until a termination condition is met. Of course I understand that and I don't usually having a problem understanding someone else's recursive solution. My problem is that my brain just doesn't think that way - I don't know how else to explain.

On the bright side, as soon as I stopped thinking about the problem thanks to your solution, I discovered how to do it iteratively using a variation on Arbitrarily Nested Loops (odometer model). If I get a chance to code it up I will but the key was to have a set of empty slots representing the combination that you copied values from as you rotate wheels on the dial. It becomes a very simple process at that point.

Cheers - L~R

a la 'Enigma' but going it one better?

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