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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2021 年分拆上市的百克生物，曾靠带状疱疹疫苗冲到 18 亿营收，被寄予厚望。
Andrew's desk fits a lot of utility into a small space
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When is West Indies vs. South Africa?West Indies vs. South Africa in the 2026 T20 World Cup starts at 4:30 a.m. ET on Feb. 26. This game takes place at the Narendra Modi Stadium.