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Two-dimensional recursive spatial subdivision.

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d3-quadtree

A quadtree recursively partitions two-dimensional space into squares, dividing each square into four equally-sized squares. Each distinct point exists in a unique leaf node; coincident points are represented by a linked list. Quadtrees can accelerate various spatial operations, such as the Barnes–Hut approximation for computing many-body forces, collision detection, and searching for nearby points.

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