Regions with many nearby points keep subdividing. Regions with few or no points stay large. The tree adapts to the data: dense areas get fine-grained cells, sparse areas stay coarse. The split grid is predetermined (always at midpoints), but the tree only refines cells that need it. Sparse regions stay as single large nodes while dense regions subdivide deeply.
buf += this_sz;，这一点在体育直播中也有详细论述
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The education secretary wants a fairer system and the Tories have leapt in with their own plan – but why now?