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摘要:
We present two local search algorithms for the k-median and k-facility location problems with linear penalties (k-MLP and k-FLPLP), two extensions of the classical k-median and k-facility location problems respectively. We show that the approximation ratios of these two algorithms are 3 + 2/p + epsilon for the k-MLP, and 2 + 1/p + root 3 + 2/p + 1/p(2) + epsilon for the k-FLPLP, respectively, where p is an element of Z(+) is a parameter of the algorithms and epsilon > 0 is a positive number. In particular, the (3 + 2/p + epsilon)-approximation improves the best known 4-approximation for the k-MLP for any p > 2.
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