A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
2025 年度，共有5309 家企业对外披露了研发人员情况，较上年度小幅增长2.23%；披露研发人员的企业数量占比75.15%，略高于上年的74.43%；披露研发人员共计388.35 万人，较上年增长3.57%——扩张速度超过了披露研发人员企业的增幅。
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