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On decision and optimization (k, l)-graph sandwich problems

机译:关于决策和最优化(k,l)-图三明治问题

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A graph G is (k,l) if its vertex set can be partitioned into at most k independent sets and l cliques. The (k,l)-Graph Sandwich Problem asks, given two graphs G(1) = (V,E-1) and G(2) = (V,E-2), whether there exists a graph G = (V,E) such that E-1 subset of or equal to E subset of or equal to E-2 and G is (k,l). In this paper, we prove that the (k,l)-Graph Sandwich Problem is NP-complete for the cases k = 1 and l = 2; k = 2 and l = 1; or k = l = 2. This completely classifies the complexity of the (k,l)-Graph Sandwich Problem as follows: the problem is NP-complete, if k + l > 2; the problem is polynomial otherwise. We consider the degree Delta constraint subproblem and completely classify the problem as follows: the problem is polynomial, for k less than or equal to 2 or Delta less than or equal to 3; the problem is NP-complete otherwise. In addition, we propose two optimization versions of graph sandwich problem for a property II: MAX-II-GSP and MIN-II-GSP. We prove that MIN-(2, 1)-GSP is a Max-SNP-hard problem, i.e., there is a positive constant epsilon, such that the existence of an epsilon-approximative algorithm for MIN-(2, 1)-GSP implies P = NP. (C) 2004 Published by Elsevier B.V.
机译:如果图形G的顶点集最多可以划分为k个独立的集和l个集团,则它是(k,l)。 (k,l)-图三明治问题询问,给定两个图G(1)=(V,E-1)和G(2)=(V,E-2),是否存在图G =(V ,E),使得等于或等于E-2的E子集和等于E-2的E-1子集和G为(k,l)。在本文中,我们证明了在k = 1和l = 2的情况下(k,l)-图夹心问题是NP完全的; k = 2和l = 1;或k = l =2。这完全将(k,l)-Graph夹心问题的复杂度分类为:如果k + l> 2,则问题为NP完全问题;否则,为k-l。否则问题就是多项式。我们考虑度数Delta约束子问题,并将问题完全分类如下:对于k小于或等于2或Delta小于或等于3,问题是多项式。否则问题是NP完全的。此外,针对性质II,我们提出了图三明治问题的两个优化版本:MAX-II-GSP和MIN-II-GSP。我们证明MIN-(2,1)-GSP是一个Max-SNP-hard问题,即存在一个正常数epsilon,从而存在MIN-(2,1)-GSP的epsilon近似算法意味着P = NP。 (C)2004由Elsevier B.V.发布

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