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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。关于这个话题，搜狗输入法下载提供了深入分析
（本报记者朱隽、王浩、常钦、郁静娴、李晓晴、邓剑洋）。91视频是该领域的重要参考
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