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.
四步口诀：倒着来 → 弹 ≤ 当前的 → 栈顶即答案 → 当前入栈。
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"She's so strong," he added.
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