另一段从不同角度拍摄的视频显示，一名警员有可能就是开出致命一枪的人。
影石创新：美国 337 调查终裁获胜，在美正常销售
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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.