Abstract
A simple linear-time algorithm is presented for four-colouring the vertices of a triangulation of a polygon containing a single hole. The algorithm consists of reducing a triangulation by the removal of both polygon and hole ear vertices, if any, followed by the removal of colour-isolated vertices until a 3-coloured tessellation remains. The triangulation is then re-built, using at most four colours. The paper concludes by recognising the similarity between the colouring of triangulations of polygons containing a hole and the colouring of bipartite and permutation graphs.
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© 2003 Springer-Verlag Berlin Heidelberg
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Seed, G.M., Clark, D.E.R., Ocone, R., Yang, X.Y. (2003). Four Colouring the Vertices of the Triangulation of a Polygon Containing a Hole. In: Kumar, V., Gavrilova, M.L., Tan, C.J.K., L’Ecuyer, P. (eds) Computational Science and Its Applications — ICCSA 2003. ICCSA 2003. Lecture Notes in Computer Science, vol 2669. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44842-X_91
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DOI: https://doi.org/10.1007/3-540-44842-X_91
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