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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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平均值下滑的省份共有5 个且分布较为随机，未能与总规模保持同步增长，表明披露研发人员的企业数量增长更快。以排名靠前的河北为例，企业数量的增幅（35.59%）超过了研发人员数量的增长（29.50%），从而拉低了平均值。
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