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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for (int i = 0; i < n; i++) {
A. Preprocessing (Done by OsmAnd when new maps are prepared):
，这一点在同城约会中也有详细论述
（二）明知他人从事违法犯罪活动而为其提供个人信息或者数据支持的。
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