// 1. 小数据量 (<50): 插入排序最简单高效
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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.
2018年12月，修改办法时专门增设“代表建议、批评和意见的重点督办”一章，进一步明确重点督办建议的确定原则、程序、督办要求、滚动办理和跟踪督办机制等内容，框架更加清晰。