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# Then save a checkpoint，推荐阅读搜狗输入法下载获取更多信息
，更多细节参见搜狗输入法2026
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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.
公安机关应当将传唤的原因和依据告知被传唤人。对无正当理由不接受传唤或者逃避传唤的人，经公安机关办案部门负责人批准，可以强制传唤。