In Go 1.25, process3 performs zero heap allocations, if
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这种方法实现简单，但需要在每个 iOS 调用点手动处理类型转换。
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.。Line官方版本下载是该领域的重要参考