arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.05345math.CO
收藏

余双凸图和Web图上元组控制的有效算法

Efficient algorithms for tuple domination on co-biconvex graphs and web graphs

María Patricia Dobson, Valeria Leoni, María Inés Lopez Pujato

摘要:

图中的一个顶点支配它自己和它的每个相邻顶点。对于一个固定的正整数$k$,\emph{$k$-tuple domination problem}是在给定的图中寻找一个最小的顶点子集,使得每个顶点至少被这个集合中的$k$顶点支配.从计算的角度来看,这个问题是NP难的。它遵循Bui-Xuan等人以前的作品。(2013)和Belmonte等人。(2013)-在具有快速可计算和有界最小宽度的图类中的局部可检查顶点子集问题的上下文中-$k$ -元组支配问题在圆弧图类中在时间$\mathcal{O}(|V(G)|^{6k+4})$中是可解的。在这项工作中,我们开发了更快的算法$k$ -元组支配的co-boconvex图和网络图,这是无与伦比的子类凹圆图,从而圆弧图。一方面,我们提出了一个$\mathcal{O}(n^2)$ -时间算法来解决它的每一个$2\leq k\leq |U|+3$,其中$U$是通用的顶点集和$n$的输入共双凸图的顶点总数。另一方面,Argiroffo等人(2010)已经从多面体的观点开始了对web图上的该问题的研究,仅针对$k=2$和$k=d(G)$的情况,其中$d(G)$等于输入web图$G$的每个顶点的度。我们完成这项研究的网络图从算法的角度来看,通过设计一个线性时间算法的基础上的整数模运算。在这项工作中提出的算法是相互独立的,但都利用循环特性的每个研究的图形类的增广邻接矩阵。

英文摘要:

A vertex in a graph dominates itself and each of its adjacent vertices. The \emph{$k$-tuple domination problem}, for a fixed positive integer $k$, is to find a minimum sized vertex subset in a given graph such that every vertex is dominated by at least $k$ vertices of this set. From the computational point of view, this problem is NP-hard. It follows from previous works by Bui-Xuan et al.~(2013) and by Belmonte et al.~(2013) -- in the context of locally checkable vertex subset problems in graph classes with quickly computable and bounded min-width -- that the $k$-tuple domination problem is solvable in time $\mathcal{O}(|V(G)|^{6k+4})$ in the class of circular-arc graphs. In this work, we develop faster algorithms for $k$-tuple domination in co-biconvex graphs and in web graphs, which are incomparable subclasses of concave-round graphs and thus of circular-arc graphs. On the one hand, we present an $\mathcal{O}(n^2)$-time algorithm for solving it for each $2\leq k\leq |U|+3$, where $U$ is the set of universal vertices and $n$ the total number of vertices of the input co-biconvex graph. On the other hand, the study of this problem on web graphs was already started by Argiroffo et al. (2010) from a polyhedral point of view only for the cases $k=2$ and $k=d(G)$, where $d(G)$ equals the degree of each vertex of the input web graph $G$. We complete this study for web graphs from an algorithmic point of view, by designing a linear-time algorithm based on the modular arithmetic for integer numbers. The algorithms presented in this work are mutually independent but both exploit the circular properties of the augmented adjacency matrices of each studied graph class.

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。

↑