A Linear Time Algorithm for Deciding Interval Graph Isomorphism


A graph is an interval graph tf and only if each of Its verttces can be associated with an interval on the real hne m such a way that two vertices are adjacent m the graph exactly when the corresponding mtervals have a nonempty mtersectmn An effictent algonthrn for testing tsomorpinsm of interval graphs ts unplemented using a data structure called a PQ-tree. The algorithm runs m O(n + e) steps for graphs having n vemces and e edges It is shown that for a somewhat larger class of graphs, namely the chordal graphs, lsomorpinsm is as hard as for general graphs

DOI: 10.1145/322123.322125

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@article{Lueker1979ALT, title={A Linear Time Algorithm for Deciding Interval Graph Isomorphism}, author={George S. Lueker and Kellogg S. Booth}, journal={J. ACM}, year={1979}, volume={26}, pages={183-195} }