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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* 时间复杂度: O(n²) 空间复杂度: O(1) 稳定: ✗，更多细节参见safew官方版本下载
Open up the app and connect to a server in Austria