Problem

Determine which of the following problems are NP-complete and which are solvable in polyno...

Determine which of the following problems are NP-complete and which are solvable in polynomial time. In each problem you are given an undirected graph G =(V, E), along with:

(a) A set of nodes L ḍV, and you must find a spanning tree such that its set of leaves includes the set L.


(b) A set of nodes LV, and you must find a spanning tree such that its set of leaves is precisely the set L.


(c) A set of nodes LV, and you must find a spanning tree such that its set of leaves is included in the set L.


(d) An integer k, and you must find a spanning tree with k or fewer leaves.


(e) An integer k, and you must find a spanning tree with k or more leaves.


(f) An integer k, and you must find a spanning tree with exactly k leaves.

(Hint: All the NP-completeness proofs are by generalization, except for one.)

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Solutions For Problems in Chapter 8