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.
Spencer, who is retiring after nearly 40 years at Microsoft, will be replaced by Asha Sharma - an executive who previously oversaw some of the firm's AI initiatives.
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