b-Coloring Parameterized by Pathwidth is XNLP-complete
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We show that the b-Coloring problem is complete for the class XNLP when parameterized by the pathwidth of the input graph. Besides determining the precise parameterized complexity of this problem, this implies that b-Coloring parameterized by pathwidth is W[t]-hard for all t, and resolves the parameterized complexity of b-Coloring parameterized by treewidth.
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