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.
（本报记者朱隽、王浩、常钦、郁静娴、李晓晴、邓剑洋）
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int randomIdx = low + rand() % (high - low + 1);，推荐阅读heLLoword翻译官方下载获取更多信息
// Oops — forgot to call reader.releaseLock()。关于这个话题，im钱包官方下载提供了深入分析
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