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arXiv 1902.03548cs.DS
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逼近$k$ -连通$m$ -控制集

Approximating $k$-connected $m$-dominating sets

Zeev Nutov

摘要:

图$G$中的节点子集$S$是$k$连通$m$ -支配集($(k,m)$-cds),如果由$S$导出的子图$G[S]$是$k$连通的,并且每个$v \in V \setminus S$在$S$中至少有$m$邻居.在$k$ -连通$m$ -支配集($(k,m)$-CDS)问题中,目标是在节点加权图中找到最小权重$(k,m)$-CDS。对于$m \geq k$,我们得到以下近似比。对于一般图,我们的比率$O(k \ln n)$改进了先前的最佳比率$O(k^2 \ln n)$,并匹配单位权重的最佳已知比率。对于单位圆盘图,我们改进的比例$O(k \ln k)$ $\min\left\{\frac{m}{m-k},k^{2/3}\right\} \cdot O(\ln^2 k)$-这是第一次的线性比例的问题,和第一个多对数比例$O(\ln^2 k)/ε$当$m \geq (1+ε)k$ ;此外,我们得到的比例$\min\left\{\frac{m}{m-k},\sqrt{k}\right\} \cdot O(\ln^2 k)$均匀的权重。这些结果是通过显示相同的比率为子集$k$ -连通性问题时,终端的集合$T$是$m$ -支配集与$m \geq k$。

英文摘要:

A subset $S$ of nodes in a graph $G$ is a $k$-connected $m$-dominating set ($(k,m)$-cds) if the subgraph $G[S]$ induced by $S$ is $k$-connected and every $v \in V \setminus S$ has at least $m$ neighbors in $S$. In the $k$-Connected $m$-Dominating Set ($(k,m)$-CDS) problem the goal is to find a minimum weight $(k,m)$-cds in a node-weighted graph. For $m \geq k$ we obtain the following approximation ratios. For general graphs our ratio $O(k \ln n)$ improves the previous best ratio $O(k^2 \ln n)$ and matches the best known ratio for unit weights. For unit disc graphs we improve the ratio $O(k \ln k)$ to $\min\left\{\frac{m}{m-k},k^{2/3}\right\} \cdot O(\ln^2 k)$ -- this is the first sublinear ratio for the problem, and the first polylogarithmic ratio $O(\ln^2 k)/ε$ when $m \geq (1+ε)k$; furthermore, we obtain ratio $\min\left\{\frac{m}{m-k},\sqrt{k}\right\} \cdot O(\ln^2 k)$ for uniform weights. These results are obtained by showing the same ratios for the Subset $k$-Connectivity problem when the set $T$ of terminals is an $m$-dominating set with $m \geq k$.

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