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Privacy preserving clustering with constraints. (English) Zbl 1499.90117

Chatzigiannakis, Ioannis (ed.) et al., 45th international colloquium on automata, languages, and programming. ICALP 2018, Prague, Czech Republic, July 9–13, 2018. Proceedings. Wadern: Schloss Dagstuhl – Leibniz Zentrum für Informatik. LIPIcs – Leibniz Int. Proc. Inform. 107, Article 96, 14 p. (2018).
Summary: The \(k\)-center problem is a classical combinatorial optimization problem which asks to find \(k\) centers such that the maximum distance of any input point in a set \(P\) to its assigned center is minimized. The problem allows for elegant 2-approximations. However, the situation becomes significantly more difficult when constraints are added to the problem. We raise the question whether general methods can be derived to turn an approximation algorithm for a clustering problem with some constraints into an approximation algorithm that respects one constraint more. Our constraint of choice is privacy: Here, we are asked to only open a center when at least \(\ell\) clients will be assigned to it. We show how to combine privacy with several other constraints.
For the entire collection see [Zbl 1392.68012].

MSC:

90B80 Discrete location and assignment
68W25 Approximation algorithms
90C27 Combinatorial optimization

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