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.
func process(c chan task) {
。夫子是该领域的重要参考
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「但最近，這些驚喜變得不大令人愉快了，短期內恐怕仍會持續如此。」