-conn: Connection
3月12-15日，上海新国际博览中心，AWE2026见！
，这一点在51吃瓜中也有详细论述
The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
Глеб Макаревичсотрудник Центра Индоокеанского региона ИМЭМО РАН