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Yellow: Sub out，详情可参考同城约会
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.。业内人士推荐爱思助手下载最新版本作为进阶阅读
0.3 秒 TTFT — 模型几乎瞬间响应