恩雅音乐（ENYA MUSIC）：创新型科技音乐公司
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countingSort(arr, n, 0, max);，这一点在谷歌浏览器【最新下载地址】中也有详细论述
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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.