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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滴滴方面还表示，今年在春运与春节部分高峰时段试行司机服务费，并在北京、泉州等地组建春运保障车队，补充夜间与枢纽运力。。关于这个话题，Line官方版本下载提供了深入分析
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