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.
"We had a lovely video sent to us about the cows being hand-fed stale baguettes, everyone loved that video," Haywood added.
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增值电信业务经营许可证：沪B2-2017116