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• W3214332583 abstract "Spanners have been shown to be a powerful tool in graph algorithms. Many spanner constructions use a certain type of clustering at their core, where each cluster has small diameter and there are relatively few spanner edges between clusters. In this paper, we provide a clustering algorithm that, given $kgeq 2$, can be used to compute a spanner of stretch $2k-1$ and expected size $O(n^{1+1/k})$ in $k$ rounds in the CONGEST model. This improves upon the state of the art (by Elkin, and Neiman [TALG'19]) by making the bounds on both running time and stretch independent of the random choices of the algorithm, whereas they only hold with high probability in previous results. Spanners are used in certain synchronizers, thus our improvement directly carries over to such synchronizers. Furthermore, for keeping the emph{total} number of inter-cluster edges small in low diameter decompositions, our clustering algorithm provides the following guarantees. Given $betain (0,1]$, we compute a low diameter decomposition with diameter bound $Oleft(frac{log n}{beta}right)$ such that each edge $ein E$ is an inter-cluster edge with probability at most $betacdot w(e)$ in $Oleft(frac{log n}{beta}right)$ rounds in the CONGEST model. Again, this improves upon the state of the art (by Miller, Peng, and Xu [SPAA'13]) by making the bounds on both running time and diameter independent of the random choices of the algorithm, whereas they only hold with high probability in previous results." @default.
• W3214332583 created "2021-11-22" @default.
• W3214332583 creator A5058859965 @default.
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• W3214332583 date "2021-11-17" @default.
• W3214332583 modified "2023-09-27" @default.
• W3214332583 title "An Improved Random Shift Algorithm for Spanners and Low Diameter Decompositions." @default.
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