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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.
。业内人士推荐搜狗输入法作为进阶阅读
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Humans can hear up to 20kHz, and all sounds above that are called ultrasound. Cats hear up to 45kHz, while dogs' range extends to 65kHz.