License: Creative Commons Attribution 3.0 Unported license (CC BY 3.0)
When quoting this document, please refer to the following
DOI: 10.4230/LIPIcs.STACS.2015.487
URN: urn:nbn:de:0030-drops-49364
URL: http://dagstuhl.sunsite.rwth-aachen.de/volltexte/2015/4936/
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Jansson, Jesper ; Li, Zhaoxian ; Sung, Wing-Kin

On Finding the Adams Consensus Tree

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Abstract

This paper presents a fast algorithm for finding the Adams consensus tree of a set of conflicting phylogenetic trees with identical leaf labels, for the first time improving the time complexity of a widely used algorithm invented by Adams in 1972 [1]. Our algorithm applies
the centroid path decomposition technique [9] in a new way to traverse the input trees' centroid paths in unison, and runs in O(k n \log n) time, where k is the number of input trees and n is the size of the leaf label set. (In comparison, the old algorithm from 1972 has a worst-case running time of O(k n^2).) For the special case of k = 2, an even faster algorithm running in O(n \cdot \frac{\log n}{\log\log n}) time is provided, which relies on an extension of the wavelet tree-based technique by Bose et al. [6] for orthogonal range counting on a grid.
Our extended wavelet tree data structure also supports truncated
range maximum queries efficiently and may be of independent interest to algorithm designers.

BibTeX - Entry

@InProceedings{jansson_et_al:LIPIcs:2015:4936,
  author =	{Jesper Jansson and Zhaoxian Li and Wing-Kin Sung},
  title =	{{On Finding the Adams Consensus Tree}},
  booktitle =	{32nd International Symposium on Theoretical Aspects of Computer Science (STACS 2015)},
  pages =	{487--499},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-78-1},
  ISSN =	{1868-8969},
  year =	{2015},
  volume =	{30},
  editor =	{Ernst W. Mayr and Nicolas Ollinger},
  publisher =	{Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{http://drops.dagstuhl.de/opus/volltexte/2015/4936},
  URN =		{urn:nbn:de:0030-drops-49364},
  doi =		{10.4230/LIPIcs.STACS.2015.487},
  annote =	{Keywords: phylogenetic tree, Adams consensus, centroid path, wavelet tree}
}

Keywords: phylogenetic tree, Adams consensus, centroid path, wavelet tree
Collection: 32nd International Symposium on Theoretical Aspects of Computer Science (STACS 2015)
Issue Date: 2015
Date of publication: 26.02.2015

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