Kevin Church/BBC News
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.，更多细节参见91视频
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Nature, Published online: 25 February 2026; doi:10.1038/s41586-025-10064-4
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int sharedp(void*d) {