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原文摘要

The goal in graph reconstruction problems is to learn an initially unknown graph using only a few queries of a specific type. Possibly the most natural query type is retrieving the distance between any two vertices of a connected, undirected, and unweighted graph. For a bounded-degree graph on $n$ vertices, Kannan, Mathieu, and Zhou [TALG 2018] showed a randomized algorithm that uses only $\tilde{\mathcal{O}}(n^{3/2})$ such queries. On the lower bound side, it is only known that any randomized algorithm needs $Ω(n\log n)$ queries. We make a significant step forward to bridging these bounds by designing a randomized algorithm that uses $n^{4/3+o(1)}$ queries. This requires extending the original approach based on Voronoi diagrams into a recursive procedure that partitions a cell into smaller cells. While such a recursive approach has been used in the related graph verification problem, in the more general graph reconstruction problem we need to operate without knowing the graph, which requires a new (and more technical) approach.