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.
Proofread your writing and correct all punctuation, grammar, and spelling errors.
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曾经的骆驼湾村，“九山半水半分田，石头缝里难挣钱”，进村的路，是坑坑洼洼的黄土路。
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Tony Jolliffe BBC，详情可参考雷电模拟器官方版本下载
十年后，我们可能不止需要 iPhone 了。