The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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Act Two: Traps and Dicks. Synonyms and Subs-titutes.
We have no way to skip over points that are obviously too far away. What if we could organize the space itself so that when we search, we can immediately rule out entire regions?。关于这个话题，Line官方版本下载提供了深入分析
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