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arXiv 2602.14550cs.DS
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更快的伪确定性最小割

Faster Pseudo-Deterministic Minimum Cut

Weizmann Institute of Science(魏茨曼科学研究所)

Yotam Kenneth-Mordoch

AI总结:

本文提出了一种更高效的伪确定性最小割算法,适用于加权图和动态环境,提高了算法效率并匹配现有最佳随机算法。

摘要:

伪确定性算法是随机算法,以高常数概率输出一个固定的规范解。最近,Agarwala和Varma在ITCS'26中首次研究了全局最小割问题的伪确定性算法,给出了一个黑盒减少方法,产生O(logn log logn)的开销。我们引入了一个自然的图论性 tie-breaking 机制,唯一选择一个规范的最小割。利用这种机制,我们获得:(i) 一个针对加权图的伪确定性最小割算法,运行时间为O(m log²n),消除了先前工作的O(logn log logn)开销,并匹配现有的随机算法。(ii) 首个在完全动态无权图中维护规范最小割的伪确定性算法,具有polylog(n)的更新时间和O(n)的查询时间。(iii) 在动态流和割查询计算模型中,对无权图的改进伪确定性算法,匹配最佳的随机算法。

英文摘要:

Pseudo-deterministic algorithms are randomized algorithms that, with high constant probability, output a fixed canonical solution. The study of pseudo-deterministic algorithms for the global minimum cut problem was recently initiated by Agarwala and Varma [ITCS'26], who gave a black-box reduction incurring an $O(\log n \log \log n)$ overhead. We introduce a natural graph-theoretic tie-breaking mechanism that uniquely selects a canonical minimum cut. Using this mechanism, we obtain: (i) A pseudo-deterministic minimum cut algorithm for weighted graphs running in $O(m\log^2 n)$ time, eliminating the $O(\log n \log \log n)$ overhead of prior work and matching existing randomized algorithms. (ii) The first pseudo-deterministic algorithm for maintaining a canonical minimum cut in a fully-dynamic unweighted graph, with $\mathrm{polylog}(n)$ update time and $\tilde{O}(n)$ query time. (iii) Improved pseudo-deterministic algorithms for unweighted graphs in the dynamic streaming and cut-query models of computation, matching the best randomized algorithms.

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。

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