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The internal Steiner tree problem: Hardness and approximations

机译:内部Steiner树问题:硬度和近似值

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Given a graph C = (V, E) with a cost function c : E → R~+ and a vertex subset R c V, an internal Steiner tree is a Steiner tree that contains all the vertices in R, and such that each vertex in R must be an internal vertex. The internal Steiner tree problem involves finding an internal Steiner tree T whose total cost ∑_[(u,v)∈E(T)] c(u, v) is the minimum. In this paper, we first show that the internal Steiner tree problem is MAX SNP-hard. We then present a (2p + 1)-approximation algorithm for solving the problem on complete graphs, where ρ is an approximation ratio for the Steiner tree problem. Currently, the best-known pis In 4+∈ < 1.39. Moreover, for the case where the cost of each edge is restricted to being either 1 or 2, we present a 7/9-approximation algorithm for the problem.
机译:给定具有成本函数c:E→R〜+的图C =(V,E)和顶点子集R c V,内部Steiner树是一个Steiner树,其中包含R中的所有顶点,并且每个顶点R中的in必须是内部顶点。内部Steiner树问题涉及找到内部Steiner树T,其总成本∑ _ [[(u,v)∈E(T)] c(u,v)为最小。在本文中,我们首先证明内部Steiner树问题是MAX SNP困难的。然后,我们提出一种(2p +1)逼近算法,用于解决完整图上的问题,其中ρ是Steiner树问题的逼近比。当前,最著名的pis In 4 +∈<1.39。此外,对于每个边的成本限制为1或2的情况,我们针对该问题提出了7/9近似算法。

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