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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The BMA's GPs committee chair, Dr Katie Bramall, said the government was at risk of creating "unrealistic expectations", pointing out GP services were already stretched.