Abstract
Circle graphs are the intersection graphs of chords in a circle. This paper presents the first sub-quadratic recognition algorithm for the class of circle graphs. Our algorithm is O(n+m) times the inverse Ackermann function, α(n+m), whose value is smaller than 4 for any practical graph. The algorithm is based on a new incremental Lexicographic Breadth-First Search characterization of circle graphs, and a new efficient data-structure for circle graphs, both developed in the paper. The algorithm is an extension of a Split Decomposition algorithm with the same running time developed by the authors in a companion paper.
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Notes
Let us mention that several definitions exist for this function, either with two variables, including some variants, or with one variable. For simplicity, we choose to use the version with one variable. This makes no practical difference since all of them could be used in our complexity bound, and they are all essentially constant. As an example, the two variable function considered in [3] satisfies α(k,n)≤4 for all integer k and for all \(n\leq\underbrace{2^{.^{.^{.^{2}}}}}_{17 \mathrm{\ times}}\).
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Financial support of E. Gioan and C. Paul was received from the French ANR project ANR-O6-BLAN-0148-01: Graph Decomposition and Algorithms (GRAAL). Financial support of M. Tedder and D. Corneil was received from Canada’s Natural Sciences and Engineering Research Council (NSERC).
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Gioan, E., Paul, C., Tedder, M. et al. Practical and Efficient Circle Graph Recognition. Algorithmica 69, 759–788 (2014). https://doi.org/10.1007/s00453-013-9745-8
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DOI: https://doi.org/10.1007/s00453-013-9745-8