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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* 时间复杂度: O(n+k) k=max-min+1 空间复杂度: O(k) 稳定: ✓，这一点在WPS官方版本下载中也有详细论述
終止聯邦層級的多元、公平、共融（DEI）計劃