free_list[classno] = h;
优衣库：3 月 9 日开售，推出供给六个款式的 T 恤（成人、童装各有两款独占版本）；
，这一点在旺商聊官方下载中也有详细论述
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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.