Proceedings of the 50th Annual ACM SIGACT Symposium on Theory of Computing 2018
DOI: 10.1145/3188745.3188930
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Constant-factor approximation for ordered k-median

Abstract: We study the Ordered k-Median problem, in which the solution is evaluated by first sorting the client connection costs and then multiplying them with a predefined non-increasing weight vector (higher connection costs are taken with larger weights). Since the 1990s, this problem has been studied extensively in the discrete optimization and operations research communities and has emerged as a framework unifying many fundamental clustering and location problems such as k-Median and k-Center. This generality, howe… Show more

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Cited by 21 publications
(53 citation statements)
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“…The theorem implies that (x, y) is an optimal solution to (OCl-P t ), then we obtain an O(1)-approximation for ordered k-median. We remark that Byrka et al [13] show that a randomized rounding procedure of Charikar and Li [19] for the standard k-median LP has the property that it produces an assignment-cost vector c satisfying Exp[ j∈D ( c j − 19ρ) + ] ≤ j,i (c ij − ρ) + x ij for every ρ ∈ R + ; that is, it gives a thresholdoblivious rounding for ℓ-centrum. Since cost(w; v) is a nonnegative linear combination of cost(ℓ; v) terms, this also gives a randomized weight-oblivious rounding for ordered k-median.…”
Section: Linear Programming Relaxationmentioning
confidence: 98%
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“…The theorem implies that (x, y) is an optimal solution to (OCl-P t ), then we obtain an O(1)-approximation for ordered k-median. We remark that Byrka et al [13] show that a randomized rounding procedure of Charikar and Li [19] for the standard k-median LP has the property that it produces an assignment-cost vector c satisfying Exp[ j∈D ( c j − 19ρ) + ] ≤ j,i (c ij − ρ) + x ij for every ρ ∈ R + ; that is, it gives a thresholdoblivious rounding for ℓ-centrum. Since cost(w; v) is a nonnegative linear combination of cost(ℓ; v) terms, this also gives a randomized weight-oblivious rounding for ordered k-median.…”
Section: Linear Programming Relaxationmentioning
confidence: 98%
“…However, it is not at all clear how to use this LP for min-max ordered problems with multiple weight functions. The algorithms of Byrka et al [13] are randomized which bound the expected cost of the ordered k-median; with multiple weights, this won't help solve the min-max problem unless one can argue very sharp concentration properties of the algorithm. The same is true for our load-balancing algorithm.…”
Section: Technical Overview and Organizationmentioning
confidence: 99%
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