#106

Number Maze

 

Given a pair of numbers, the start and end point, find a path between the two using only three possible operations: 1. double 2. halve (odd numbers cannot be halved) 3. add 2 Find the shortest path through the “maze”. Because there are multiple shortest paths, you must return the length of the shortest path, not the path itself.

	(= 1 (__ 1 1))
	(= 3 (__ 3 12))
	(= 3 (__ 12 3))
	(= 3 (__ 5 9))
	(= 9 (__ 9 2))
	(= 5 (__ 9 12))