arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1803.07097cs.DS
收藏

网格图可达性问题的$\tilde{O}(n^{1/3})$ -空间算法

$\tilde{O}(n^{1/3})$-Space Algorithm for the Grid Graph Reachability Problem

Ryo Ashida, Kotaro Nakagawa

摘要:

有向图可达性问题将$n$ -顶点有向图$G=(V,E)$以及两个区别的顶点$s$和$t$作为输入。问题是确定在$G$中是否存在从$s$到$t$的路径。这是NL类的典型完全问题。Asano等人提出了一种求解有向网格和平面图可达性问题的$\tilde{O}(\sqrt{n})$空间和多项式时间算法。本文的主要结果是证明了仅用$\tilde{O}(n^{1/3})$空间就可以在多项式时间内解决限制于格图的有向图可达问题。

英文摘要:

The directed graph reachability problem takes as input an $n$-vertex directed graph $G=(V,E)$, and two distinguished vertices $s$ and $t$. The problem is to determine whether there exists a path from $s$ to $t$ in $G$. This is a canonical complete problem for class NL. Asano et al. proposed an $\tilde{O}(\sqrt{n})$ space and polynomial time algorithm for the directed grid and planar graph reachability problem. The main result of this paper is to show that the directed graph reachability problem restricted to grid graphs can be solved in polynomial time using only $\tilde{O}(n^{1/3})$ space.

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。

↑