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• W2952286870 abstract "Previous chapter Next chapter Full AccessProceedings Proceedings of the 2011 Annual ACM-SIAM Symposium on Discrete Algorithms (SODA)Ranking with Submodular ValuationsYossi Azar and Iftah GamzuYossi Azar and Iftah Gamzupp.1070 - 1079Chapter DOI:https://doi.org/10.1137/1.9781611973082.81PDFBibTexSections ToolsAdd to favoritesExport CitationTrack CitationsEmail SectionsAboutAbstract We study the problem of ranking with submodular valuations. An instance of this problem consists of a ground set [m], and a collection of n monotone sub-modular set functions f1, …, fn, where each function fi : 2[m] → ℝ+. An additional input ingredient is a weight vector w ∊ ℝ+n. The goal is to find a linear ordering of the ground set elements that minimizes the weighted cover time of the functions. The cover time of a function is the minimal number of elements in the prefix of the linear ordering that form a set whose corresponding function value is greater than a unit threshold value. Our main result is an O(ln(1/ε))-approximation algorithm for the problem, where ε is the smallest nonzero marginal value that any function may gain from some element. Our algorithm orders the elements using an adaptive residual updates scheme, which may be of independent interest. We also prove that the problem is Ω(ln(1/ε))-hard to approximate, unless P = NP. This implies that the outcome of our algorithm is optimal up to constant factors. Previous chapter Next chapter RelatedDetails Published:2011ISBN:978-0-89871-993-2eISBN:978-1-61197-308-2 https://doi.org/10.1137/1.9781611973082Book Series Name:ProceedingsBook Code:PR138Book Pages:xviii-1788" @default.
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• W2952286870 date "2011-01-23" @default.
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• W2952286870 title "Ranking with Submodular Valuations" @default.
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• W2952286870 doi "https://doi.org/10.1137/1.9781611973082.81" @default.
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