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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.
警方表示，阿爾巴尼斯於當地時間18:00（格林尼治標準時間07:00）從官邸緊急疏散，並被轉移到另一個地點數小時。