Closest-Pair Queries and Minimum-Weight Queries are Equivalent for Squares

10/13/2020

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by   Abrar Kazi, et al.

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Let S be a set of n weighted points in the plane and let R be a query range in the plane. In the range closest pair problem, we want to report the closest pair in the set R ∩ S. In the range minimum weight problem, we want to report the minimum weight of any point in the set R ∩ S. We show that these two query problems are equivalent for query ranges that are squares, for data structures having Ω(log n) query times. As a result, we obtain new data structures for range closest pair queries with squares.