"Because we can, because we're young, we push ourselves too hard, we burn the candle at both ends, she said, which created problems that arose when people where in their 50s.
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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.，更多细节参见旺商聊官方下载
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