This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.
南方周末:肖赛结束后,你是不是几乎一直在路上?
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三个别人帮忙拍的视频里,都能找到阿爸的身影,他始终站着,鲜少与人交谈。阿爸要么站在大人那桌旁,低头用那双像“鸡爪”的手滑着手机;要么双手背在身后,与人寒暄一两句,要么在小孩桌边站着,双手像多余似的挂在身前。阿妈说:“何止他手多余,整个人看起来都有点多余。”
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