return j; // 返回pivot的最终位置
（五）其他扰乱电信、金融实名制管理的行为。
，这一点在爱思助手下载最新版本中也有详细论述
我的一位老师曾经建议：如果你能想象自己去做任何别的事，那你或许应该去做那件事。
В Финляндии предупредили об опасном шаге ЕС против России09:28
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.