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.
Publication date: 10 March 2026
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for (int gap = n / 2; gap 0; gap /= 2) {
C++ API — 用于原生集成并支持流式传输的引擎、会话和对话类