优化：随机选基准避免最坏情况 O(n²)
In microcode, the privilege check reduces to a single conditional jump:
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18:22, 27 февраля 2026Интернет и СМИ
The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
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