Faster algorithms for edge connectivity via random 2-out contractions

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We provide a simple new randomized contraction approach to the global minimum cut problem for simple undirected graphs. The contractions exploit 2-out edge sampling from each vertex rather than the standard uniform edge sampling. We demonstrate the power of our new approach by obtaining better algorithms for sequential, distributed, and parallel models of computation. Our end results include the following randomized algorithms for computing edge connectivity, with high probability1: • Two sequential algorithms with complexities O(m log n) and O(m + n log3 n). These improve on a long line of developments including a celebrated O(m log3 n) algorithm of Karger [STOC'96] and the state of the art O(m log2 n(log log n)2) algorithm of Henzinger et al. [SODA'17]. Moreover, our O(m + n log3 n) algorithm is optimal when m = Ω(n log3 n). • An Õ(n0.8D0.2 + n0.9) round distributed algorithm, where D denotes the graph diameter. This improves substantially on a recent breakthrough of Daga et al.[STOC'19], which achieved a round complexity of Õ(n1−1/353D1/353 + n1−1/706), hence providing the first sublinear distributed algorithm for exactly computing the edge connectivity. • The first O(1) round algorithm for the massively parallel computation setting with linear memory per machine.

Original languageEnglish
Title of host publication31st Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2020
EditorsShuchi Chawla
Number of pages20
PublisherAssociation for Computing Machinery
Publication date2020
Pages1260-1279
ISBN (Electronic)9781611975994
DOIs
Publication statusPublished - 2020
Event31st Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2020 - Salt Lake City, United States
Duration: 5 Jan 20208 Jan 2020

Conference

Conference31st Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2020
LandUnited States
BySalt Lake City
Periode05/01/202008/01/2020
SponsorACM Special Interest Group on Algorithms and Computation Theory (SIGACT), SIAM Activity Group on Discrete Mathematics

ID: 258499831