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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the concept was well-known in the computer industry. As IBM designed the 2984,
Олег Давыдов (Редактор отдела «Интернет и СМИ»)