We consider problems where the input is a set of points in the plane and an integer k, and the task is to find a subset S of the input points of size k such that S satisfies some property. We focus on properties that depend only on the order type of the points and are monotone under point removals. We exhibit a property defined by three forbidden patterns for which finding a k-point subset with the property is W[1]-complete and (assuming the exponential time hypothesis) cannot be solved in time n^{o(k/log k)}. However, we show that problems of this type are fixed-parameter tractable for all properties that include all collinear point sets, properties that exclude at least one convex polygon, and properties defined by a single forbidden pattern.
@InProceedings{eppstein_et_al:LIPIcs.IPEC.2018.11, author = {Eppstein, David and Lokshtanov, Daniel}, title = {{The Parameterized Complexity of Finding Point Sets with Hereditary Properties}}, booktitle = {13th International Symposium on Parameterized and Exact Computation (IPEC 2018)}, pages = {11:1--11:14}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-084-2}, ISSN = {1868-8969}, year = {2019}, volume = {115}, editor = {Paul, Christophe and Pilipczuk, Michal}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.IPEC.2018.11}, URN = {urn:nbn:de:0030-drops-102121}, doi = {10.4230/LIPIcs.IPEC.2018.11}, annote = {Keywords: parameterized complexity, fixed-parameter tractability, point set pattern matching, largest pattern-avoiding subset, order type} }
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