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.
"command": "cmdValidatePromo",
，这一点在服务器推荐中也有详细论述
5AD LD_DESCRIPTOR LCALL ; same subroutine
A global craze for Korean culture is making its humblest snacks unaffordable
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