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.
2026-02-27 00:00:00:0 （2026年2月26日第十四届全国人民代表大会常务委员会第二十一次会议通过）
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劉珈汶認為，家人被帶走，可能與她抗議中國在倫敦興建大型使館計劃有關，意圖恐嚇她。