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arXiv 1607.04545cs.DS
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关于具有少数极小分隔符的图的距离- $d$独立集及其它问题

On Distance-$d$ Independent Set and other problems in graphs with few minimal separators

Pedro Montealegre, Ioan Todinca

摘要:

Fomin和Villanger(STACS 2010)证明了最大独立集,反馈顶点集,以及更一般的寻找树的最大导出子图的问题,最多有一个常数$t$,可以在多项式时间内解决具有多项式多个最小分隔符的图类。我们在两个方向上扩展这些结果。设$\Gpoly$是一类至多具有$\poly(n)$最小分离子的图,对某些多项式$\poly$ .我们证明了图$G$的奇次幂最多有和图$G$一样多的极小分隔符.因此,对于任何偶数$d$,\textsc{Distance-$d$ Independent Set}是$\Gpoly$上的多项式,其中包括在成对距离至少$d$处找到顶点的最大集合。对于任意奇数的$d \geq 3$,该问题在弦图上是NP-困难的.我们还提供了多项式算法的连通顶点覆盖和连通反馈顶点集的$\Gpoly$的子类,包括弦和圆弧图,我们讨论了独立控制问题的变种。

英文摘要:

Fomin and Villanger (STACS 2010) proved that Maximum Independent Set, Feedback Vertex Set, and more generally the problem of finding a maximum induced subgraph of treewith at most a constant $t$, can be solved in polynomial time on graph classes with polynomially many minimal separators. We extend these results in two directions. Let $\Gpoly$ be the class of graphs with at most $\poly(n)$ minimal separators, for some polynomial $\poly$. We show that the odd powers of a graph $G$ have at most as many minimal separators as $G$. Consequently, \textsc{Distance-$d$ Independent Set}, which consists in finding maximum set of vertices at pairwise distance at least $d$, is polynomial on $\Gpoly$, for any even $d$. The problem is NP-hard on chordal graphs for any odd $d \geq 3$. We also provide polynomial algorithms for Connected Vertex Cover and Connected Feedback Vertex Set on subclasses of $\Gpoly$ including chordal and circular-arc graphs, and we discuss variants of independent domination problems.

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