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.
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return this.state[2];，推荐阅读体育直播获取更多信息
一位中國留學生，在美國德州當上了牛仔。。咪咕体育直播在线免费看对此有专业解读