Faster Cut-Equivalent Trees in Simple Graphs

Faster Cut-Equivalent Trees in Simple Graphs
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简单图中更快的等价割树

DOI:
10.4230/lipics.icalp.2022.109
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发表时间:
2021
期刊:
--
影响因子:
--
通讯作者:
Tianyi Zhang
Tianyi Zhang
中科院分区:
--
文献类型:
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作者:
Tianyi Zhang

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设G =(V,E)是n阶无向连通简单图. G的割等价树是在同一顶点集V上的边加权树,使得对于任意一对顶点s,t ∈ V,该树的最小(s,t)-割也是G的最小(s,t)-割,且这两个割具有相同的割值。在最近的一篇论文[Abboud,Krauthgamer和Trabelsi,STOC 2021]中,作者提出了第一个用于构造割等价树的次立方时间算法。算法的时间复杂度为O(n)。5)运行时间。后来,这个运行时间被两个独立的作品[Abboud,Krauthgamer和Trabelsi,FOCS 2021]和[Li,Panigrahi,Saranurak,FOCS 2021]显着提高到n 2+ o(1),然后到(m + n 1)。9)1+ o(1)[Abboud,Krauthgamer和Trabelsi,SODA 2022]。在本文中,我们提高了运行时间的e O(n 2)图,如果近线性时间最大流算法存在,或e O(n 17 / 8)使用目前最快的最大流算法。虽然我们的算法是比以前的作品慢,运行时界变得更好的一个子多项式因子在密集的简单图时,假设近线性的时间最大流算法。
Let G = ( V, E ) be an undirected connected simple graph on n vertices. A cut-equivalent tree of G is an edge-weighted tree on the same vertex set V , such that for any pair of vertices s, t ∈ V , the minimum ( s, t )-cut in the tree is also a minimum ( s, t )-cut in G , and these two cuts have the same cut value. In a recent paper [Abboud, Krauthgamer and Trabelsi, STOC 2021], the authors propose the first subcubic time algorithm for constructing a cut-equivalent tree. More specifically, their algorithm has 1 e O ( n 2 . 5 ) running time. Later on, this running time was significantly improved to n 2+ o (1) by two independent works [Abboud, Krauthgamer and Trabelsi, FOCS 2021] and [Li, Panigrahi, Saranurak, FOCS 2021], and then to ( m + n 1 . 9 ) 1+ o (1) by [Abboud, Krauthgamer and Trabelsi, SODA 2022]. In this paper, we improve the running time to e O ( n 2 ) graphs if near-linear time max-flow algorithms exist, or e O ( n 17 / 8 ) using the currently fastest max-flow algorithm. Although our algorithm is slower than previous works, the runtime bound becomes better by a sub-polynomial factor in dense simple graphs when assuming near-linear time max-flow algorithms.
多对数最大流中的确定性最小割
DOI: --
发表时间: 2020
期刊: Annual Symposium on Foundations of Computer Science
影响因子: --
作者:
Li, Jason;Panigrahi, Debmalya
通讯作者: Panigrahi, Debmalya
DOI: 10.1145/3357713.3384247
发表时间: 2019-10
期刊: Proceedings of the 52nd Annual ACM SIGACT Symposium on Theory of Computing
影响因子: --
作者:
Yang P. Liu;Aaron Sidford
通讯作者: Yang P. Liu;Aaron Sidford