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Complexity of Paths, Trails and Circuits in Arc-Colored Digraphs

机译:弧形有向图的路径,轨迹和电路的复杂性

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We deal with different algorithmic questions regarding properly arc-colored s-t paths, trails and circuits in arc-colored digraphs. Given an arc-colored digraph D~c with c > 2 colors, we show that the problem of maximizing the number of arc disjoint properly arc-colored s-t trails can be solved in polynomial time. Surprisingly, we prove that the determination of one properly arc-colored s-t path is NP-complete even for planar digraphs containing no properly arc-colored circuits and c = Ω(n), where n denotes the number of vertices in D~c. If the digraph is an arc-colored tournament, we show that deciding whether it contains a properly arc-colored circuit passing through a given vertex x (resp., properly arc-colored Hamiltonian s-t path) is NP-complete, even if c = 2. As a consequence, we solve a weak version of an open problem posed in Gutin et. al. [17].
机译:我们处理关于圆弧色有向图中正确的圆弧色s-t路径,轨迹和电路的不同算法问题。给定一个c> 2种颜色的弧形有色图D〜c,我们证明了在多项式时间内可以解决最大化弧形不相交的数目的问题,而弧形s-t轨迹正确。出乎意料的是,我们证明即使对于不包含适当弧形电路且c =Ω(n)的平面图,确定一个适当弧形s-t路径也是NP完全的,其中n表示D〜c中的顶点数。如果有向图是弧形的锦标赛,则表明即使确定c =,它是否包含通过给定顶点x的正确弧形电路(即,正确的弧形哈密顿量st路径),也是NP完全的。因此,我们解决了Gutin等人提出的开放问题的一个弱版本。等[17]。

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