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.
员工安全意识培训同样不可忽视，人为因素往往是最薄弱的环节。，更多细节参见同城约会
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圖像來源，Krupa Padhy
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