On Reachability Mixed Arborescence Packing
On Reachability Mixed Arborescence Packing
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DOI:
10.1016/j.disopt.2018.10.002
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发表时间:
2018-08
期刊:
影响因子:
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通讯作者:
Tatsuya Matsuoka;Shin-ichi Tanigawa
中科院分区:
文献类型:
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作者:
Tatsuya Matsuoka;Shin-ichi Tanigawa
As a generalization of Edmonds’ arborescence packing theorem, Kamiyama–Katoh–Takizawa (2009) provided a good characterization of directed graphs that contain arc-disjoint arborescences spanning the set of vertices reachable from each root. Fortier–Király–Léonard–Szigeti–Talon (2018) asked whether the result can be extended to mixed graphs by allowing both directed arcs and undirected edges. In this paper, we solve this question by developing a polynomial-time algorithm for finding a collection of edge and arc-disjoint arborescences spanning the set of vertices reachable from each root in a given mixed graph.