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arXiv · 2202.08870

A Linear-Time Algorithm for Product Structure in Planar Graphs

Prosenjit Bose·Kaya Gouin·Pat Morin·Saeed Odak
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Abstract

The \emph{Product Structure Theorem} for planar graphs (Dujmovi\'c et al.\ \emph{JACM}, \textbf{67}(4):22) states that any planar graph is contained in the strong product of a planar $3$-tree, a path, and a $3$-cycle. We give a simple linear-time algorithm for finding this partition as well as several related partitions. This improves on the previous $O(n\log n)$ time algorithm for finding this partition (Morin.\ \emph{Algorithmica}, \textbf{85}(5):1544--1558). The algorithm is practical; we provide open-source C and C++ implementations that, even on modest hardware, can process graphs with millions of vertices in a matter of seconds.

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Prosenjit Bose, Kaya Gouin, Pat Morin, Saeed Odak. 2022-02-17. A Linear-Time Algorithm for Product Structure in Planar Graphs. https://arxiv.org/abs/2202.08870

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