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.
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{ 30, 20, 18, 28, 33, 41, 55, 39 },。关于这个话题，51吃瓜提供了深入分析
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