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A fast distributed approximation algorithm for minimum spanning trees

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Abstract

We present a distributed algorithm that constructs an O(log n)-approximate minimum spanning tree (MST) in any arbitrary network. This algorithm runs in time Õ(D(G) + L(G, w)) where L(G, w) is a parameter called the local shortest path diameter and D(G) is the (unweighted) diameter of the graph. Our algorithm is existentially optimal (up to polylogarithmic factors), i.e., there exist graphs which need Ω(D(G) + L(G, w)) time to compute an H-approximation to the MST for any \(H\,\in\,[1, \Theta({\rm log} n)]\) . Our result also shows that there can be a significant time gap between exact and approximate MST computation: there exists graphs in which the running time of our approximation algorithm is exponentially faster than the time-optimal distributed algorithm that computes the MST. Finally, we show that our algorithm can be used to find an approximate MST in wireless networks and in random weighted networks in almost optimal Õ(D(G)) time.

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Authors and Affiliations

  1. Department of Computer Science, Purdue University, West Lafayette, IN, 47907, USA

    Maleq Khan & Gopal Pandurangan

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  1. Maleq Khan
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  2. Gopal Pandurangan
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Correspondence to Maleq Khan.

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Khan, M., Pandurangan, G. A fast distributed approximation algorithm for minimum spanning trees. Distrib. Comput. 20, 391–402 (2008). https://doi.org/10.1007/s00446-007-0047-8

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