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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陆逸轩：很大一部分是。有一些音乐会本来就在我既定的演出计划里，但更多是提前就已经被赛事安排好的演出。很多音乐厅甚至在比赛结果公布的几个月、几年之前，就已经以“肖赛冠军得主”为卖点开始售票了。在这种情况下，我是必须完成这些演出的。，更多细节参见搜狗输入法2026
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