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- W1966999110 abstract "We consider the list update problem under a sequence of requests for sets of items, and for this problem we investigate the competitiveness features of two algorithms. We prove that algorithm Move-Set-to-Front (MSF) is (1 + β)-competitive, where β is the size of the largest requested set, and that a lower bound is roughly 2. We also provide an upper bound to the MSF competitive ratio by relating it to the size n of the list, showing that it is (1 + n /4)-competitive in general, and O( n ) -competitive with a small constraint to the size of the requested sets. Moreover, we prove that the randomized algorithm BIT-for-Sets is (1 + 3 4 β)-competitive against an oblivious adversary. Also, we study two extensions. The first one generalizes the list update problem under a sequence of requests of sets by considering weighted lists, where a weight representing a visiting cost is associated with each item. For this case we give a competitiveness result as well. The second one is a variant, where the list is searched to retrieve whichever element of the currently requested set (the first that can be found in the list). For this problem we provide negative results." @default.
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- W1966999110 date "1994-08-01" @default.
- W1966999110 modified "2023-09-29" @default.
- W1966999110 title "The list update problem and the retrieval of sets" @default.
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- W1966999110 doi "https://doi.org/10.1016/0304-3975(94)00010-7" @default.
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