// 测试用例（可直接运行验证）
Ring-2.5-1T 的表现：。业内人士推荐雷电模拟器官方版本下载作为进阶阅读
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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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