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.
[4]《泰山石化被指濒临破产债权人要求启动清盘程序》经济观察网
，这一点在搜狗输入法2026中也有详细论述
Elon Musk has promoted ideas of British decline
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