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.
Example: deleting a passkey in Bitwarden
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The problem is spotty surveillance by under-resourced regulators.
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（二）向境外单位转让的完全在境外使用的技术；