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.
Plato (left) imagined humans were once whole, with four arms, four legs and two faces, before Zeus (right) split them, leaving each half searching for its other，推荐阅读Line官方版本下载获取更多信息
"assignment": [false, false, false, false, false, false, false, false, false, false]，更多细节参见WPS官方版本下载
1. 建堆：将数组构建成大顶堆（父节点 = 子节点）
Medicine (antiviral tablets) can help to speed up recovery and avoid longer-lasting problems.