Approximation algorithms for metric facility location problems
In this paper we present a 1.52-approximation algorithm for the metric uncapacitated facility
location problem, and a 2-approximation algorithm for the metric capacitated facility location
problem with soft capacities. Both these algorithms improve the best previously known
approximation factor for the corresponding problem, and our soft-capacitated facility location
algorithm achieves the integrality gap of the standard linear programming relaxation of the
problem. Furthermore, we will show, using a result of Thorup, that our algorithms can be …
location problem, and a 2-approximation algorithm for the metric capacitated facility location
problem with soft capacities. Both these algorithms improve the best previously known
approximation factor for the corresponding problem, and our soft-capacitated facility location
algorithm achieves the integrality gap of the standard linear programming relaxation of the
problem. Furthermore, we will show, using a result of Thorup, that our algorithms can be …
In this paper we present a 1.52-approximation algorithm for the metric uncapacitated facility location problem, and a 2-approximation algorithm for the metric capacitated facility location problem with soft capacities. Both these algorithms improve the best previously known approximation factor for the corresponding problem, and our soft-capacitated facility location algorithm achieves the integrality gap of the standard linear programming relaxation of the problem. Furthermore, we will show, using a result of Thorup, that our algorithms can be implemented in quasi-linear time.

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