Approximating the online set multicover problems via randomized winnowing

Piotr Berman, Bhaskar DasGupta

    Research output: Contribution to journalConference articlepeer-review

    2 Scopus citations


    In this paper, we consider the weighted online set k-multicover problem. In this problem, we have an universe V of elements, a family S of subsets of V with a positive real cost for every S G ε S, and a "coverage factor" (positive integer) k. A subset {io, i1...} ⊆ V of elements are presented online in an arbitrary order. When each element ip is presented, we are also told the collection of all (at least k) sets Sip ⊆ S and their costs in which p belongs and we need to select additional sets from Sip if necessary such that our collection of selected sets contains at least k sets that contain the element ip. The goal is to minimize the total cost of the selected sets1. In this paper, we describe a new randomized algorithm for the online multicover problem based on the randomized winnowing approach of [11]. This algorithm generalizes and improves some earlier results in [1]. We also discuss lower bounds on competitive ratios for deterministic algorithms for general k based on the approaches in [1].

    Original languageEnglish (US)
    Pages (from-to)110-121
    Number of pages12
    JournalLecture Notes in Computer Science
    StatePublished - 2005
    Event9th International Workshop on Algorithms and Data Structures, WADS 2005 - Waterloo, Canada
    Duration: Aug 15 2005Aug 17 2005

    All Science Journal Classification (ASJC) codes

    • Theoretical Computer Science
    • Computer Science(all)


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