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- W2945031003 abstract "We present a new, simple, algorithm for the local vertex connectivity problem (LocalVC) introduced by Nanongkai~et~al. [STOC'19]. Roughly, given an undirected unweighted graph $G$, a seed vertex $x$, a target volume $nu$, and a target separator size $k$, the goal of LocalVC is to remove $k$ vertices `near' $x$ (in terms of $nu$) to disconnect the graph in `local time', which depends only on parameters $nu$ and $k$. In this paper, we present a simple randomized algorithm with running time $O(nu k^2)$ and correctness probability $2/3$. Plugging our new localVC algorithm in the generic framework of Nanongkai~et~al. immediately lead to a randomized $tilde O(m+nk^3)$-time algorithm for the classic $k$-vertex connectivity problem on undirected graphs. ($tilde O(T)$ hides $text{polylog}(T)$.) This is the first near-linear time algorithm for any $4leq k leq text{polylog} n$. Previous fastest algorithm for small $k$ takes $tilde O(m+n^{4/3}k^{7/3})$ time [Nanongkai~et~al., STOC'19]. This work is inspired by the algorithm of Chechik~et~al. [SODA'17] for computing the maximal $k$-edge connected subgraphs. Forster and Yang [arXiv'19] has independently developed local algorithms similar to ours, and showed that they lead to an $tilde O(k^3/epsilon)$ bound for testing $k$-edge and -vertex connectivity, resolving two long-standing open problems in property testing since the work of Goldreich and Ron [STOC'97] and Orenstein and Ron [Theor. Comput. Sci.'11]. Inspired by this, we use local approximation algorithms to obtain bounds that are near-linear in $k$, namely $tilde O(k/epsilon)$ and $tilde O(k/epsilon^2)$ for the bounded and unbounded degree cases, respectively. For testing $k$-edge connectivity for simple graphs, the bound can be improved to $tilde O(min(k/epsilon, 1/epsilon^2))$." @default.
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- W2945031003 date "2019-05-14" @default.
- W2945031003 modified "2023-10-07" @default.
- W2945031003 title "Computing and Testing Small Vertex Connectivity in Near-Linear Time and Queries." @default.
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