In this paper, we study the problem of opening centers to cluster a set of clients in a metric space so as to minimize the sum of the costs of the centers and of the cluster radii, in a dynamic environment where clients arrive and depart, and the solution must be updated efficiently while remaining competitive with respect to the current optimal solution. We call this dynamic sum-of-radii clustering problem. We present a data structure that maintains a solution whose cost is within a constant factor of the cost of an optimal solution in metric spaces with bounded doubling dimension and whose worst-case update time is logarithmic in the parameters of the problem.
@InProceedings{henzinger_et_al:LIPIcs.ESA.2017.48, author = {Henzinger, Monika and Leniowski, Dariusz and Mathieu, Claire}, title = {{Dynamic Clustering to Minimize the Sum of Radii}}, booktitle = {25th Annual European Symposium on Algorithms (ESA 2017)}, pages = {48:1--48:10}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-049-1}, ISSN = {1868-8969}, year = {2017}, volume = {87}, editor = {Pruhs, Kirk and Sohler, Christian}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ESA.2017.48}, URN = {urn:nbn:de:0030-drops-78749}, doi = {10.4230/LIPIcs.ESA.2017.48}, annote = {Keywords: dynamic algorithm, clustering, approximation, doubling dimension} }
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