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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盗窃、损坏、擅自移动使用中的其他公共交通工具设施、设备，或者以抢控驾驶操纵装置、拉扯、殴打驾驶人员等方式，干扰公共交通工具正常行驶的，处五日以下拘留或者一千元以下罚款；情节较重的，处五日以上十日以下拘留。
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當雨果出生時，貝爾說：「這簡直是一個奇蹟。」