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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.
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鸡柳大人，一年时间从600家店扩张到6000家店，核心就是抓住了消费者的需求：将炸鸡分为多肉型、少肉型组合，用同样的价格提供了更多选择，自然获得消费者青睐。马记永将拉面定义为“大片牛腱子面”，就是为了与普通面馆形成差异化。反观很多门店，产品老化、缺乏新意，就像一个月吃重复的家常菜会腻一样，消费者自然不会反复到店。