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.
1990年，在《滴水穿石的启示》一文中，习近平同志这样写道：
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To say sailing hasn't been smooth of late at Ubisoft would be an understatement. Last year, the company reorganized its corporate structure under a system of "creative houses." The first, Vantage Studios, is partly owned by Tencent and now oversees Assassin's Creed. Then in October, franchise head Marc-Alexis Côté left the company. He later claimed he was "asked to step aside" and is suing his former employer.
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2025年9月，徐淙祥收到农业农村部的书面答复。“是农业农村部与生态环境部等部门综合会商后给出的答复，其中还特意分为‘推进农业绿色发展’和‘加强农业品牌建设’两个方面，答复内容详细且具有针对性。”徐淙祥说。
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