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.
for (let num of nums1) {，这一点在旺商聊官方下载中也有详细论述
。safew官方下载是该领域的重要参考
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