从后向前扫描已排序部分，找到插入位置，元素后移腾出空间
В Финляндии предупредили об опасном шаге ЕС против России09:28
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ВсеОбществоПолитикаПроисшествияРегионыМосква69-я параллельМоя страна。夫子是该领域的重要参考
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.
DOING IT THE RIGHT WAY