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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第十八条 纳税人发生增值税法第二十条规定情形的，税务机关可以按顺序依照下列方法核定销售额：
其中白色是广角像素、蓝色是窄角像素，转动屏幕，窄角像素就看不见了。