The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.
// 易错点5：忘记push当前索引 → 前面的位置无法获取当前身高的参考，结果全错
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Expert shares how to view rare planetary parade
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