Abstract
We present a multi-exchange local search algorithm for approximating the capacitated facility location problem (CFLP), where a new local improvement operation is introduced that possibly exchanges multiple facilities simultaneously. We give a tight analysis for our algorithm and show that the performance guarantee of the algorithm is between \(3+2\sqrt{2}-\epsilon\) and \(3+2\sqrt{2}+\epsilon\) for any given constant ε> 0. Previously known best approximation ratio for the CFLP is 7.88, due to Mahdian and Pál (2003), based on the operations proposed by Pál, Tardos and Wexler (2001). Our upper bound \(3+2\sqrt{2}+\epsilon\) also matches the best known ratio, obtained by Chudak and Williamson (1999), for the CFLP with uniform capacities. In order to obtain the tight bound of our new algorithm, we make interesting use of the notion of exchange graph of Pál et al. and techniques from the area of parallel machine scheduling.
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Zhang, J., Chen, B., Ye, Y. (2004). A Multi-exchange Local Search Algorithm for the Capacitated Facility Location Problem. In: Bienstock, D., Nemhauser, G. (eds) Integer Programming and Combinatorial Optimization. IPCO 2004. Lecture Notes in Computer Science, vol 3064. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-25960-2_17
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