New Trade-Offs for Fully Dynamic Matching via Hierarchical EDCS
New Trade-Offs for Fully Dynamic Matching via Hierarchical EDCS
复制标题
通过分层 EDCS 实现完全动态匹配的新权衡
DOI:
10.1137/1.9781611977073.140
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Khanna, Sanjeev.
中科院分区:
文献类型:
--
作者:
Behnezhad, Soheil;Khanna, Sanjeev.
We study the maximum matching problem infully dynamicgraphs: a graph is undergoing both edge insertions and deletions, and the goal is to efficiently maintain a large matching after each edge update. This problem has received considerable attention in recent years. The known algorithms naturally exhibit a trade-off between the quality of the matching maintained (i.e., the approximation ratio) and the time needed per update. While several interesting results have been obtained, the optimal behavior of this trade-off remains largely unclear. Our main contribution is a new approach to designing fully dynamic approximate matching algorithms that in aunified mannernot only (essentially) recovers all previously known trade-offs that were achieved via very different techniques, but reveals some new ones as well.Specifically, we introduce a generalization of theedge-degree constrained subgraph(EDCS) of Bernstein and Stein (2015) that we call thehierarchical EDCS(HEDCS). We also present a randomized algorithm for efficiently maintaining an HEDCS. In anm-edge graph with maximum degree Δ, for any integerk≥ 0 that is essentially the number of levels of the hierarchy in HEDCS, our algorithm takesÕ(min{Δ1/(k+ 1),m1/(2k+2)}) worst-case update-time and maintains an (almost)α(k)-approximate matching where we show:These bounds recover all previous trade-offs known for dynamic matching in the literature up to logarithmic factors in the update-time.α(2) > .612 for bipartite graphs, andα(2) > .609 for general graphs.Note that these approximations are obtained inÕ(min{Δ1/3,m1/6}) update-time.α(3) > .563 for bipartite graphs, andα(3) > .532 for general graphs.Note that these approximations are obtained inÕ(min{Δ1/4,m1/8}) update-time.
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DOI:
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期刊:
2019 IEEE 60th Annual Symposium on Foundations of Computer Science (FOCS)
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