2-dimensional space, Euclidean metric (Closest Pair Problem)

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Description

Given $n$ points in 2-dimensional space equipped with the Eucildean metric, find a pair of points with the smallest distance between them.

Related Problems

Related: k-dimensional space, $l_m$ (or $l_\infty$) norm, 2-dimensional space, $l_m$ (or $l_\infty$) norm, 2-dimensional array representation

Parameters

$n$: number of points

$k$: dimension of space

Table of Algorithms

Name Year Time Space Approximation Factor Model Reference
Khuller; Matias 1995 $O(n)$ $O(n)$, not sure if this is auxiliary Exact Randomized Time & Space
Shamos; Hoey 1975 $O(n \log n)$ $O(n)$ Exact Deterministic Time

Time Complexity Graph

Closest Pair Problem - 2-dimensional space, Euclidean metric - Time.png

Space Complexity Graph

Closest Pair Problem - 2-dimensional space, Euclidean metric - Space.png

Time-Space Tradeoff

Closest Pair Problem - 2-dimensional space, Euclidean metric - Pareto Frontier.png