但我知道这终究是权宜之计。我能锁住她的钱袋，却锁不住外界对她的诱惑，她能为了租房便利就轻易解除我对手机的设置，未来也可能在别的诱惑下，想出别的办法来绕过我现在设下的限制。
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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