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arXiv 1802.05623cs.DS
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软容量动态加权顶点覆盖的$O(1)$ -近似算法

An $O(1)$-Approximation Algorithm for Dynamic Weighted Vertex Cover with Soft Capacity

Hao-Ting Wei, Wing-Kai Hon, Paul Horn, Chung-Shou Liao, Kunihiko Sadakane

摘要:

本研究考虑动态环境中的(软)容量限制顶点覆盖问题。该问题推广了近年来得到广泛研究的顶点覆盖问题的动态模型。给定一个动态变化的顶点加权图$G=(V,E)$,它允许边插入和边删除,目标是设计一个数据结构,保持一个近似的最小顶点覆盖,同时满足每个顶点的容量约束。也就是说,当拾取覆盖中的顶点$v$的副本时,由副本覆盖的$v$的关联边的数量达到给定容量的$v$。我们扩展Bhattacharya等人。的工作[SODA'15和ICALP'15],以获得一个确定性的原始-对偶算法,用于保持一个常数因子近似最小容量顶点覆盖与$O(\log n / ε)$摊销更新时间,其中$n$是在图中的顶点数。该算法可以扩展到(1)一个更一般的模型,其中每个边与一个非均匀和不可分裂的需求,(2)更一般的容量限制集覆盖问题。

英文摘要:

This study considers the (soft) capacitated vertex cover problem in a dynamic setting. This problem generalizes the dynamic model of the vertex cover problem, which has been intensively studied in recent years. Given a dynamically changing vertex-weighted graph $G=(V,E)$, which allows edge insertions and edge deletions, the goal is to design a data structure that maintains an approximate minimum vertex cover while satisfying the capacity constraint of each vertex. That is, when picking a copy of a vertex $v$ in the cover, the number of $v$'s incident edges covered by the copy is up to a given capacity of $v$. We extend Bhattacharya et al.'s work [SODA'15 and ICALP'15] to obtain a deterministic primal-dual algorithm for maintaining a constant-factor approximate minimum capacitated vertex cover with $O(\log n / ε)$ amortized update time, where $n$ is the number of vertices in the graph. The algorithm can be extended to (1) a more general model in which each edge is associated with a nonuniform and unsplittable demand, and (2) the more general capacitated set cover problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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