Faster Cut-Equivalent Trees in Simple Graphs
Faster Cut-Equivalent Trees in Simple Graphs
复制标题
简单图中更快的等价割树
DOI:
10.4230/lipics.icalp.2022.109
复制
发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Tianyi Zhang
中科院分区:
文献类型:
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作者:
Tianyi Zhang
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.
DOI:
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发表时间:
2020
期刊:
Annual Symposium on Foundations of Computer Science
影响因子:
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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:
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作者:
Yang P. Liu;Aaron Sidford
通讯作者:
Yang P. Liu;Aaron Sidford