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Sixth International Conference on Parallel and Distributed Computing Applications and Technologies (PDCAT'05)
Approximating Spanning Trees with Inner Nodes Cost
Dalian, China
December 05-December 08
ISBN: 0-7695-2405-2
Rudolf Fleischer, Fudan University, China
Qi Ge, Fudan University, China
Jian Li, Fudan University, China
Shijun Tian, Fudan University, China
Haitao Wang, Fudan University, China
We consider the practical NP-complete problem of finding a minimum weight spanning tree with both edge weights and inner nodes weights. We present two polynomial time algorithms with approximation factors of 2.35 ? ln n and 2Hn, respectively, where n is the number of nodes in the graph and Hn is the n-th Harmonic number. This nearly matches the lower bound of (l-\in )Hn, for any \in \ge 0. We also give an approximation algorithm with approximation factor \Delta - 1, where \Delta is the maximum degree of the graph. For metric spaces, we give a 3.105-approximation algorithm and show that an approximation factor of 1.463 is impossible unless {NP \subseteq DTIME[n^{O(\log longn)} ]}.
Citation:
Rudolf Fleischer, Qi Ge, Jian Li, Shijun Tian, Haitao Wang, "Approximating Spanning Trees with Inner Nodes Cost," pdcat, pp.660-664, Sixth International Conference on Parallel and Distributed Computing Applications and Technologies (PDCAT'05), 2005
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