Paths with Prescribed Endpoints in Semicomplete and Locally Semicomplete Digraphs

Hanzhi Bai; Jin Yan; Jia Zhou

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arXiv · 2608.17439

Paths with Prescribed Endpoints in Semicomplete and Locally Semicomplete Digraphs

Hanzhi Bai·Jin Yan·Jia Zhou

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Abstract

We study two open path problems with prescribed endpoints posed by Bang-Jensen and Gutin. The first asks for a longest $(x,y)$-path in a semicomplete digraph. The second asks whether a locally semicomplete digraph has a Hamiltonian $(x,y)$-path. For semicomplete digraphs, we solve the first problem when the endpoints lie in different strong components. We also prove that if a non-Hamiltonian longest $(x,y)$-path omits a set of vertices, then these vertices together with $x$ and $y$ have a Hamiltonian $(y,x)$-path. This gives an equivalent cycle problem. We then give an exact algorithm that runs in polynomial time when the number of omitted vertices is fixed. For locally semicomplete digraphs, we determine the possible endpoints in the connected nonstrong case. Known results then leave only strong, nonsemicomplete, non-$4$-strong digraphs unresolved. Every such digraph of order at least five has a strong vertex cut of size at most three. Two examples show that a spanning directed path together with a vertex-disjoint directed cycle is not sufficient, and that vertices of one strong component need not occur consecutively on a Hamiltonian path.

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BibTeX RIS

Hanzhi Bai, Jin Yan, Jia Zhou. 2026-09-04. Paths with Prescribed Endpoints in Semicomplete and Locally Semicomplete Digraphs. https://arxiv.org/abs/2608.17439

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