arXiv:2611.10191 · v1

Strong Connectivity Oracle for Multiple Failures via Rooted Flow-Augmentation

首次提交 2026-11-07 04:09

版本更新 2026-11-07 04:09

雷达观测 2026-11-10 10:11

摘要

We present a significantly improved $k$-fault-tolerant strong connectivity oracle, one of the most basic data structures on a directed graph $G$ that, given any set $F$ of failed edges of size $|F|\le k$, answers whether $G \setminus F$ is strongly connected. For every constant $k$, our oracle only uses $n^{1+o(1)}$ space and $n^{o(1)}$ query time. No prior result can achieve $o(n^{2})$ space and $o(n)$ query time, \emph{even when $k=2$}. Previous oracles either require $Ω(n)$ query time [BCR18], or $Ω(n^2)$ space [vdBS19]. Our main technical contribution is a \emph{rooted} version of the highly successful flow augmentation technique, which may be of independent interest. Given a directed graph $G$, an integer $k$, and a source vertex $s$, we can sample a set of edges $A$ such that each minimal $s$-rooted cut of size at most $k$ becomes an $s$-rooted min-cut in $G + A$ with probability $2^{-poly(k)}n^{-o(1)}$.

作者备注：SODA 2027