文章基本信息

标题：More Dynamic Data Structures for Geometric Set Cover with Sublinear Update Time
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作者：Chan, Timothy M. ; He, Qizheng
期刊名称：LIPIcs : Leibniz International Proceedings in Informatics
电子版ISSN：1868-8969
出版年度：2021
卷号：189
页码：25:1-25:14
DOI：10.4230/LIPIcs.SoCG.2021.25
出版社：Schloss Dagstuhl -- Leibniz-Zentrum fuer Informatik
摘要：We study geometric set cover problems in dynamic settings, allowing insertions and deletions of points and objects. We present the first dynamic data structure that can maintain an O(1)-approximation in sublinear update time for set cover for axis-aligned squares in 2D . More precisely, we obtain randomized update time O(n^{2/3 Î´}) for an arbitrarily small constant Î´ > 0. Previously, a dynamic geometric set cover data structure with sublinear update time was known only for unit squares by Agarwal, Chang, Suri, Xiao, and Xue [SoCG 2020]. If only an approximate size of the solution is needed, then we can also obtain sublinear amortized update time for disks in 2D and halfspaces in 3D . As a byproduct, our techniques for dynamic set cover also yield an optimal randomized O(nlog n)-time algorithm for static set cover for 2D disks and 3D halfspaces, improving our earlier O(nlog n(log log n)^{O(1)}) result [SoCG 2020].
关键词：Geometric set cover; approximation algorithms; dynamic data structures; sublinear algorithms; random sampling