# Question & Answer: You are given a set of N sticks, which are lying on top of each other in some con- figuration. Each stick is specified by its…..

You are given a set of N sticks, which are lying on top of each other in some con- figuration. Each stick is specified by its two endpoints; each endpoint is an ordered triple giving its x, y, and z coordinates; no stick is vertical. A stick may be picked up only if there is no stick on top of it.

Explain how to write a routine that takes two sticks a and b and reports whether a is above, below, or unrelated to b. (This has nothing to do with graph theory.)

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Question & Answer: You are given a set of N sticks, which are lying on top of each other in some con- figuration. Each stick is specified by its…..
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Give an algorithm that determines whether it is possible to pick up all the sticks, and if so, provides a sequence of stick pickups that accomplishes this.