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Computing Vertex-Disjoint Paths using MAOs
Johanna E. Preißer, Jens M. Schmidt · 2016-09-21 · via cs.DS updates on arXiv.org

Let G be a graph with minimum degree $δ$. It is well-known that maximal adjacency orderings (MAOs) compute a vertex set S such that every pair of S is connected by at least $δ$ internally vertex-disjoint paths in G. We present an algorithm that, given any pair of S, computes these $δ$ paths in linear time O(n+m). This improves the previously best solutions for these special vertex pairs, which were flow-based. Our algorithm simplifies a proof about pendant pairs of Mader and makes a purely existential proof of Nagamochi algorithmic.