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Complexity of (p, 1)-total labelling

机译:(p,1)-总标记的复杂度

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A (p, 1)-total labelling of a graph G = (V, E) is a total colouring L from V boolean OR E into {0,...,l} such that vertical bar L(v) - L(e)vertical bar >= p whenever an edge e is incident to a vertex v. The minimum l for which G admits a (p, 1)-total labelling is denoted by lambda(p)(G). The case p = 1 corresponds to the usual notion of total colouring, which is NP-hard to compute even for cubic bipartite graphs [C.J. McDiarmid, A. Sanchez-Arroyo, Total colouring regular bipartite graphs is NP-hard, Discrete Math. 124 (1994). 155-162]. In this paper we assume p >= 2. It is easy to show that lambda(p)(G) >= Delta + p - 1, whered Delta is the maximum degree of G. Moreover, when G is bipartite, Delta + p is an upper bound for lambda(p)(G), leaving only two possible values. In this paper, we completely settle the computational complexity of deciding whether lambda(p)(G) is equal to Delta + p - 1 or to Delta + p when G is bipartite. This is trivial when Delta <= p, polynomial when Delta = 3 and p = 2, and NP-complete in the remaining cases.
机译:图G =(V,E)的(p,1)-总标记是从V布尔OR E到{0,...,l}的总着色L,使得竖线L(v)-L( e)每当边缘e入射到顶点v时,竖线> =p。G允许总标记为(p,1)的最小值l用lambda(p)(G)表示。 p = 1的情况对应于总着色的通常概念,即使对于立方二分图,这也是NP难以计算的。 McDiarmid,A。Sanchez-Arroyo,总着色规则二分图是NP-hard,离散数学。 124(1994)。 155-162]。在本文中,我们假设p> =2。很容易证明lambda(p)(G)> = Delta + p-1,其中Delta是G的最大程度。而且,当G为二分时,Delta + p是lambda(p)(G)的上限,仅保留两个可能的值。在本文中,我们完全解决了确定G是二分式时lambda(p)(G)等于Delta + p-1还是等于Delta + p的计算复杂性。当Delta <= p时,这是微不足道的;当Delta = 3且p = 2时,是多项式的;在其余情况下,NP完全。

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