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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，详情可参考同城约会
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人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用。夫子是该领域的重要参考
int i = 0, j = 0, k = left; // i:左数组指针, j:右数组指针, k:原数组指针