На кадрах видна сожительница похитителя, он сам в наручниках в квартире и обстановка в ней.
优点：计算简单，导数恒为1（正区间），缓解梯度消失
，详情可参考91视频
* @param arr 数组
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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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