Range queries ask "what's inside this box?" But sometimes the question is "what's nearest to this location?" This is the nearest neighbor problem, and you don't know how big your search radius should be. The nearest point might be right next to you or far away.
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，更多细节参见51吃瓜
3. 对每个桶内排序（可用任意排序算法）
He added that what happened at the Baftas had at least raised awareness, and made Tourette's "a very public subject in a very short space of time".