A 7/3-Approximation for Feedback Vertex Sets in Tournaments

A 7/3-Approximation for Feedback Vertex Sets in Tournaments
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DOI:
10.4230/lipics.esa.2016.67
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发表时间:
2015-11
期刊:
ArXiv
影响因子:
--
通讯作者:
Matthias Mnich;V. V. Williams-V.;László A. Végh
Matthias Mnich;V. V. Williams-V.;László A. Végh
中科院分区:
其他
文献类型:
--
作者:
Matthias Mnich;V. V. Williams-V.;László A. Végh

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我们考虑锦标赛中的最小权重反馈顶点集问题:给定具有非负顶点权重的比赛,删除与所有周期相交的最小重量的顶点。这个问题是$ \ mathsf {np} $ - 难以准确解决,独特的游戏近似于一个比2更好的因素。我们提出了第一个$ 7/3 $近似算法的此问题比率$ 5/2 $由Cai等人提供。 [FOCS 1998,SICOMP 2001]。
We consider the minimum-weight feedback vertex set problem in tournaments: given a tournament with non-negative vertex weights, remove a minimum-weight set of vertices that intersects all cycles. This problem is $\mathsf{NP}$-hard to solve exactly, and Unique Games-hard to approximate by a factor better than 2. We present the first $7/3$ approximation algorithm for this problem, improving on the previously best known ratio $5/2$ given by Cai et al. [FOCS 1998, SICOMP 2001].