// ⚠️ 易错点1：长度≤1的数组本身有序，返回0而非n
At the other end of one of the SDLC links might be an IBM 3770 Data
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Cash handling is fraught with peril. Bills are fairly small and easy to hide,，详情可参考搜狗输入法2026
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.