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PerlMonks 
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( #3333=superdoc: print w/ replies, xml )  Need Help?? 
All,
I was having a conversation with blokhead in the CB concerning the most efficient solution to this problem. Not having any idea how to determine the big O notation, I ran a few tests to see how well my solution scaled. The first thing I noticed was the average number of guesses doubled every time I increased the search group by a factor of 10. Then I noticed something really cool  it also corresponded to a power of 2. This allowed me to calculate the average case scenario for any number
So for 12_345 you can expect 16.42, and for 123_456_789 you can expect 262.67 As you can see this scales quite well. While this is the average case, the worst case scenario should still scale reasonably well. Cheers  L~R In reply to Re: Triangle Numbers Revisited
by Limbic~Region

