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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brush_texture: “soft bleeding edges”，这一点在Safew下载中也有详细论述
他說，如果法院限制他徵收這些關稅的能力，那將是「經濟與國家安全的災難」。