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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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如今38歲的這位前海事工程師迄今從事過的最偏遠、最具挑戰性的工作，是現時南極「哈利六號」研究站的站長。，更多细节参见51吃瓜
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