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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第十条 增值税法第十三条所称应税交易，应当同时符合下列条件：
// 易错点4：条件写成"<"而非"<="，会导致相同值的元素被错误保留