L(h, 1, 1)-labeling of outerplanar graphs

Tiziana Calamoneri (), Emanuele Fusco (), Richard Tan () and Paola Vocca ()

Mathematical Methods of Operations Research, 2009, vol. 69, issue 2, 307-321

Abstract: An L(h, 1, 1)-labeling of a graph is an assignment of labels from the set of integers {0, . . . , λ} to the nodes of the graph such that adjacent nodes are assigned integers of at least distance h ≥ 1 apart and all nodes of distance three or less must be assigned different labels. The aim of the L(h, 1, 1)-labeling problem is to minimize λ, denoted by λ h, 1, 1 and called span of the L(h, 1, 1)-labeling. As outerplanar graphs have bounded treewidth, the L(1, 1, 1)-labeling problem on outerplanar graphs can be exactly solved in O(n 3 ), but the multiplicative factor depends on the maximum degree Δ and is too big to be of practical use. In this paper we give a linear time approximation algorithm for computing the more general L(h, 1, 1)-labeling for outerplanar graphs that is within additive constants of the optimum values. Copyright Springer-Verlag 2009

Keywords: Graph labeling; Frequency assignment; Condition at distance three (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1007/s00186-008-0261-6

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