Are negative numbers and zero allowed to be a starting point or  
target?  I'm assuming no, but I'd like a confirmation.

~ ryan ~


On Dec 30, 2005, at 8:37 AM, Ruby Quiz wrote:

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> by Christer Nilsson
>
> You have a starting point and a target, say 2 and 9.
>
> You have a set of three operations:
>
> 	double
> 	halve    (Odd numbers cannot be halved.)
> 	add_two
>
> Problem: Move from the starting point to the target, minimizing the  
> number of
> operations.
>
> 	Examples:
> 	
> 	solve(2,9)  # => [2,4,8,16,18,9]
> 	solve(9,2)  # => [9,18,20,10,12,6,8,4,2]
>