A linear-time kernelization for the Rooted k-Leaf Outbranching Problem

A linear-time kernelization for the Rooted k-Leaf Outbranching Problem
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有根 k 叶分支问题的线性时间核化

DOI:
10.1016/j.dam.2015.04.028
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发表时间:
2013
期刊:
Revue d'epidemiologie et de sante publique
影响因子:
--
通讯作者:
Frank Kammer
Frank Kammer
中科院分区:
--
文献类型:
--
作者:
Frank Kammer

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摘要在有根k-叶分支问题中,给出了一个有向图G=(V,E),G的一个顶点r和一个整数k,目标是找到G的一棵有≥k个叶的r-根生成外树(G的一个子树,其顶点集V,所有边都指向远离r,≥k个叶)。对于有根k-Leaf分支问题,我们提出了一个线性时间算法,该算法计算一个具有O(K6)个顶点和O(K7)条边的问题核。将新结果与Dregault和Thomassé(2009)的结果相结合,可以在O(n+m+k14)时间内找到n-顶点m-边有向图的一个具有二次点数和边数的核。
Abstract In the Rooted k-Leaf Outbranching Problem, a digraph G=(V, E), a vertex r of G, and an integer k are given, and the goal is to find an r-rooted spanning outtree of G with≥ k leaves (a subtree of G with vertex set V, all edges directed away from r, and≥ k leaves). We present a linear-time algorithm that computes a problem kernel with O (k 6) vertices and O (k 7) edges for the Rooted k-Leaf Outbranching Problem. By combining the new result with a result of Daligault and Thomassé (2009), a kernel with a quadratic number of vertices and edges can be found on n-vertex m-edge digraphs in time O (n+ m+ k 14).
DOI: 10.1007/978-3-662-44465-8_24
发表时间: 2014
期刊: ArXiv
影响因子: --
作者:
Stefan Fafianie;Stefan Kratsch
通讯作者: Stefan Kratsch
DOI: 10.1007/s00453-013-9774-3
发表时间: 2011-12
期刊: Algorithmica
影响因子: 1.1
作者:
René van Bevern
通讯作者: René van Bevern