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arXiv 1502.04803cs.CCcs.DS
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稀疏图上的重构

Reconfiguration on sparse graphs

Daniel Lokshtanov, Amer E. Mouawad, Fahad Panolan, M. S. Ramanujan, Saket Saurabh

摘要:

顶点子集图问题Q定义了输入图的哪些顶点子集是可行解。顶点子集问题的一个重新配置变体是,给定两个大小为k的可行解S和T,是否有可能通过顶点添加和删除的序列将S转换为T,使得每个中间集也是大小为k的可行解。研究了两个经典顶点子集问题的重构变形,即独立集和支配集。我们用ISR表示前者,用DSR表示后者。ISR和DSR在有界带宽的图上都是PSPACE-完全的,在一般图上都是W[1]-难参数化的。当输入图是有界退化的或nowhere稠密的时,我们证明了ISR是由k参数化的固定参数可处理的。作为一个推论,我们积极回答一个公开的问题,关于有界树宽图的问题的参数化的复杂性。此外,我们的技术推广了最近的结果表明,ISR是固定参数听话的平面图和有界度的图形。对于DSR,我们证明了当输入图不包含大的bicliques,一类图,其中包括有界退化和无处稠密图的图时,由k参数化的固定参数易处理的问题。

英文摘要:

A vertex-subset graph problem Q defines which subsets of the vertices of an input graph are feasible solutions. A reconfiguration variant of a vertex-subset problem asks, given two feasible solutions S and T of size k, whether it is possible to transform S into T by a sequence of vertex additions and deletions such that each intermediate set is also a feasible solution of size bounded by k. We study reconfiguration variants of two classical vertex-subset problems, namely Independent Set and Dominating Set. We denote the former by ISR and the latter by DSR. Both ISR and DSR are PSPACE-complete on graphs of bounded bandwidth and W[1]-hard parameterized by k on general graphs. We show that ISR is fixed-parameter tractable parameterized by k when the input graph is of bounded degeneracy or nowhere-dense. As a corollary, we answer positively an open question concerning the parameterized complexity of the problem on graphs of bounded treewidth. Moreover, our techniques generalize recent results showing that ISR is fixed-parameter tractable on planar graphs and graphs of bounded degree. For DSR, we show the problem fixed-parameter tractable parameterized by k when the input graph does not contain large bicliques, a class of graphs which includes graphs of bounded degeneracy and nowhere-dense graphs.

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