Representative families: A unified tradeoff-based approach
Representative families: A unified tradeoff-based approach
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DOI:
10.1016/j.jcss.2015.11.008
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发表时间:
2014-02
期刊:
影响因子:
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通讯作者:
H. Shachnai;M. Zehavi
中科院分区:
文献类型:
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作者:
H. Shachnai;M. Zehavi
Given a matroid M=(E, I), and a family S of p-subsets of E, a subfamily S ˆ⊆ S represents S if for any X∈ S and Y⊆ E∖ X satisfying X∪ Y∈ I, there is a set X ˆ∈ S ˆ disjoint from Y, where X ˆ∪ Y∈ I. We show that a powerful technique for computing representative families, introduced by Fomin et al.(2014)[5], leads to a unified approach for substantially improving the running times of parameterized algorithms for some classic problems. This includes k-Partial Cover, k-Internal Out-Branching, and Long Directed Cycle, among others. Our approach exploits an interesting tradeoff between running time and the representative family size.