Optimal distributed coloring algorithms for planar graphs in the LOCAL model

Shiri Chechik, Doron Mukhtar

Research output: Contribution to conferencePaperpeer-review

Abstract

In this paper, we consider distributed coloring for planar graphs with a small number of colors. Our main result is an optimal (up to a constant factor) O(log n) time algorithm for 6-coloring planar graphs. Our algorithm is based on a novel technique that in a nutshell detects small structures that can be easily colored given a proper coloring of the rest of the vertices and removes them from the graph until the graph contains a small enough number of edges. We believe this technique might be of independent interest. In addition, we present a lower bound for 4-coloring planar graphs that essentially shows that any algorithm (deterministic or randomized) for 4-coloring planar graphs requires Ω(n) rounds. We therefore completely resolve the problems of 4-coloring and 6-coloring for planar graphs in the LOCAL model.

Original languageEnglish
Pages787-804
Number of pages18
DOIs
StatePublished - 2019
Event30th Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2019 - San Diego, United States
Duration: 6 Jan 20199 Jan 2019

Conference

Conference30th Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2019
Country/TerritoryUnited States
CitySan Diego
Period6/01/199/01/19

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