Fredman’s Trick Meets Dominance Product: Fine-Grained Complexity of Unweighted APSP, 3SUM Counting, and More
Fredman’s Trick Meets Dominance Product: Fine-Grained Complexity of Unweighted APSP, 3SUM Counting, and More
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Fredman 的技巧与主导产品的结合:未加权 APSP、3SUM 计数等的细粒度复杂性
DOI:
10.1145/3564246.3585237
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发表时间:
2023
期刊:
影响因子:
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通讯作者:
Xu, Yinzhan
中科院分区:
文献类型:
--
作者:
Chan, Timothy M.;Vassilevska Williams, Virginia;Xu, Yinzhan
In this paper we carefully combine Fredman’s trick [SICOMP’76] and Matoušek’s approach for dominance product [IPL’91] to obtain powerful results in fine-grained complexity.Under the hypothesis that APSP for undirected graphs with edge weights in {1, 2, …,n} requiresn3−o(1)time (when ω=2), we show a variety of conditional lower bounds, including ann7/3−o(1)lower bound for unweighted directed APSP and ann2.2−o(1)lower bound for computing the Minimum Witness Product between twon×nBoolean matrices, even if ω=2, improving upon their trivialn2lower bounds. Our techniques can also be used to reduce the unweighted directed APSP problem to other problems. In particular, we show that (when ω = 2), if unweighted directed APSP requiresn2.5−o(1)time, then Minimum Witness Product requiresn7/3−o(1)time.We show that, surprisingly, many central problems in fine-grained complexity are equivalent to their natural counting versions. In particular, we show that Min-Plus Product and Exact Triangle are subcubically equivalent to their counting versions, and 3SUM is subquadratically equivalent to its counting version.We also obtain new algorithms using new variants of the Balog-Szemerédi-Gowers theorem from additive combinatorics. For example, we get anO(n3.83) time deterministic algorithm for exactly counting the number of shortest paths in an arbitrary weighted graph, improving the textbookO(n4) time algorithm. We also get faster algorithms for 3SUM in preprocessed universes, and deterministic algorithms for 3SUM on monotone sets in {1, 2, …,n}d.
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DOI:
--
发表时间:
2021
期刊:
and Programming (ICALP 2021
影响因子:
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作者:
Gu, Yuzhou;Polak, Adam;Vassilevska Williams, Virginia;Xu, Yinzhan
通讯作者:
Xu, Yinzhan
DOI:
--
发表时间:
2019
期刊:
ACM-SIAM Symposium on Discrete Algorithms
影响因子:
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作者:
V. V. Williams;Yinzhan Xu
通讯作者:
Yinzhan Xu
DOI:
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发表时间:
2019
期刊:
International Colloquium on Automata, Languages and Programming
影响因子:
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作者:
Ran Duan;Ce Jin;Hongxun Wu
通讯作者:
Hongxun Wu
DOI:
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发表时间:
2020
期刊:
Information Technology Convergence and Services
影响因子:
--
作者:
Andrea Lincoln;Adam Polak;V. V. Williams
通讯作者:
V. V. Williams
DOI:
--
发表时间:
2020
期刊:
SIAM Symposium on Simplicity in Algorithms
影响因子:
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作者:
Timothy M. Chan;Qizheng He
通讯作者:
Qizheng He