Abstract
Clique-width is one of the graph complexity measures leading to polynomial
special-case algorithms for generally NP-complete problems, e.g. graph
colourability. The best two currently known algorithms for verifying
c-colourability of graphs represented as clique-width terms are optimised
towards two different extreme cases, a constant number of colours and a very
large number of colours. We present a way to unify these approaches in a single
relatively simple algorithm that achieves the state of the art complexity in
both cases. The unified algorithm also provides a speed-up for a large number
of colours.
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