The longest cycle problem is polynomial on interval graphs

The longest cycle problem is polynomial on interval graphs
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最长循环问题是区间图上的多项式

DOI:
10.1016/j.tcs.2021.01.005
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发表时间:
2021
影响因子:
1.1
通讯作者:
石艺
石艺
中科院分区:
计算机科学4区
文献类型:
--
作者:
尚建辉;李鹏;石艺

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最长循环问题是在图中找到具有最大顶点的循环的问题。尽管它可以在少数平凡图类上以多项式时间求解,但最长循环问题众所周知是 NP 完全问题。为了解决最长周期问题,人们付出了很多努力。然而,据我们所知,没有多项式算法可以解决任何非平凡的图类。区间图是弦图和星体三自由图的交集,被认为是具有最长周期问题多项式算法的非试验图类。 2009 年,K. Ioannidou, G.B. Mertzios 和 S.D. Nikolopoulos 在 Ioannidou 等人中提出了一种用于区间图最长路径问题的多项式算法。 (2009)[19]。受他们工作的启发,我们研究了区间图的最长循环问题。在本文中,我们提出了第一个用于区间图最长循环问题的多项式算法。在运行时间为 O(n8) 的多项式算法中提出了动态规划方法,其中 n 是输入图的顶点数。使用类似的方法,我们设计了一种多项式算法来解决区间图上最长的 k 厚子图问题,这将在另一项单独的工作中介绍。根据我们发现的 k 厚区间图的有趣性质(例如,当且仅当 G 为 1 厚时,区间图 G 是可追踪的;当且仅当 G 为 2 厚时,G 是哈密顿连通的;当且仅当 G 是 3 厚时,G 是哈密顿连通的,等等),本文提出的算法对于研究区间图上的跨越连通性非常重要。
The longest cycle problem is the problem of finding a cycle with maximal vertices in a graph. Although it is solvable in polynomial time on few trivial graph classes, the longest cycle problem is well known as NP-complete. A lot of efforts have been devoted to the longest cycle problem. To the best of our knowledge however, there are no polynomial algorithms that can solve any of the non-trivial graph classes. Interval graphs, the intersection of chordal graphs and asteroidal triple-free graphs, are known to be the non-trial graph classes that have polynomial algorithm of the longest cycle problem. In 2009, K. Ioannidou, G.B. Mertzios and S.D. Nikolopoulos presented a polynomial algorithm for the longest path problem on interval graphs in Ioannidou et al. (2009) [19]. Inspired by their work, we investigate the longest cycle problem of interval graphs. In this paper, we present the first polynomial algorithm for the longest cycle problem on interval graphs. A dynamic programming approach is proposed in the polynomial algorithm that runs in O(n8) time, where n is the number of vertices of the input graph. Using a similar approach, we design a polynomial algorithm to solve the longest k-thick subgraph problem on interval graphs which will be presented in another separate work. According to the interesting properties of k-thick interval graphs that we discovered (e.g., an interval graph G is traceable if and only if G is 1-thick, G is hamiltonian if and only if G is 2-thick, G is hamiltonian connected if and only if G is 3-thick and so on), the algorithm presented in this paper can be important in studying the spanning connectivity on interval graphs.
DOI: 10.1137/130910658
发表时间: 2013-02
期刊: ArXiv
影响因子: --
作者:
D. Rautenbach;Jean-Sébastien Sereni
通讯作者: D. Rautenbach;Jean-Sébastien Sereni
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发表时间: 2016
期刊: Discussiones Mathematicae - Graph Theory
影响因子: --
作者:
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通讯作者: Yin Jun
DOI: --
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期刊: Ars Comb.
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发表时间: 2009-08
期刊: --
影响因子: --
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发表时间: 2011-10-01
期刊: ALGORITHMICA
影响因子: 1.1
作者:
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