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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// 易错点4：条件写成"<"而非"<="，会导致相同值的元素被错误保留，推荐阅读爱思助手下载最新版本获取更多信息
Credit: The Pokémon Company。业内人士推荐im钱包官方下载作为进阶阅读
面对来自德国的外甥和镜头，大舅无所顾忌，他直言财产当年被掠夺。但他谈论战争本身甚少，弥漫于言谈间的，多是家庭创痛。