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.
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04。关于这个话题，heLLoword翻译官方下载提供了深入分析
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