Abstract

There has been a great deal of recent work on approximation algorithms for facility location problems [9]. We consider the capacitated facility location problem with hard capacities. We are given a set of facilities, \({\mathcal F}\), and a set of clients \({\mathcal D}\) in a common metric space. Each facility i has a facility opening costf i and capacityu i that specifies the maximum number of clients that may be assigned to this facility. We want to open some facilities from the set \({\mathcal F}\) and assign each client to an open facility so that at most u i clients are assigned to any open facility i. The cost of assigning client j to facility i is given by their distance c ij , and our goal is to minimize the sum of the facility opening costs and the client assignment costs.

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