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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In 2022 Nasa issued three $5m contracts to companies to design a reactor.
// 复制剩余元素（只需复制左数组剩余，右数组已在原位置），更多细节参见同城约会
В России ответили на имитирующие высадку на Украине учения НАТО18:04