We give a 2-approximation algorithm for the Maximum Agreement Forest problem on two rooted binary trees. This NP-hard problem has been studied extensively in the past two decades, since it can be used to compute the Subtree Prune-and-Regraft (SPR) distance between two phylogenetic trees. Our result improves on the very recent 2.5-approximation algorithm due to Shi, Feng, You and Wang (2015). Our algorithm is the first approximation algorithm for this problem that uses LP duality in its analysis.
@InProceedings{schalekamp_et_al:LIPIcs.ICALP.2016.70, author = {Schalekamp, Frans and van Zuylen, Anke and van der Ster, Suzanne}, title = {{A Duality Based 2-Approximation Algorithm for Maximum Agreement Forest}}, booktitle = {43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016)}, pages = {70:1--70:14}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-013-2}, ISSN = {1868-8969}, year = {2016}, volume = {55}, editor = {Chatzigiannakis, Ioannis and Mitzenmacher, Michael and Rabani, Yuval and Sangiorgi, Davide}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICALP.2016.70}, URN = {urn:nbn:de:0030-drops-62149}, doi = {10.4230/LIPIcs.ICALP.2016.70}, annote = {Keywords: Maximum agreement forest, phylogenetic tree, SPR distance, subtree prune-and-regraft distance, computational biology} }
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