Now that we can build the tree, let's use it to search. Finding a specific point means starting at the root and asking: which child quadrant contains this coordinate? Then you recurse into that child and ask again. Each level of the tree cuts the search space by roughly three-quarters.
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// 步骤2：按位置降序排序（离终点越近的车越先处理），更多细节参见safew官方版本下载