// 3. 要求稳定排序: 归并排序
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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然而，特朗普在這場演說中並未提出太多新政策。
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