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.
全国“一盘棋”，锚定推动水利高质量发展、保障我国水安全目标，“十四五”时期完成水利建设投资5.68万亿元，2022年以来连续4年完成年投资超过1万亿元。截至目前，我国建成世界上规模最大、功能最全、惠及人口最多的水利基础设施体系。
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Some police officers we spoke to have since acknowledged failures in intelligence, planning and command. Several said they had been unprepared for a crowd rapidly mobilised on Discord. Others questioned why military support did not arrive sooner.
‘셔틀콕 여제’ 안세영, 전영오픈 2연패 시동