[&:first-child]:overflow-hidden [&:first-child]:max-h-full"
Across all three versions, there’s a mockToString or spoof helper. But the V3 implementation is subtly more robust than the V2 one, and it’s worth examining why.
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优点：输出范围在 (0,1)，可以表示概率
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.