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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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OPPO Find N6 或配备自修复记忆玻璃
正定，是习近平同志从政起步的地方。当年，正定每年上缴征购粮7600万斤，是“农业学大寨”先进县。可是粮食交得越多，群众收入越低，正定实际上是个“高产穷县”。