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.
近日，中共中央办公厅印发《关于在全党开展树立和践行正确政绩观学习教育的通知》。《通知》指出，经党中央同意，在全党开展树立和践行正确政绩观学习教育。
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