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.
// First, we acquire a reader that gives an exclusive lock
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开局之年的“第一课”，习近平总书记特别强调了一个词——“适配度”：
第六十八条 房屋出租人将房屋出租给身份不明、拒绝登记身份信息的人的，或者不按规定登记承租人姓名、有效身份证件种类和号码等信息的，处五百元以上一千元以下罚款；情节较轻的，处警告或者五百元以下罚款。