constant size make and thus a stack-allocated backing store, and
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.
，详情可参考Line官方版本下载
// 第二步：遍历nums1，从Map中直接查询每个元素的结果（O(1)查询，无需重复计算）
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Just… don’t do it with JavaScript ffs.