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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.
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過去一年尤其動盪。里亞爾暴跌引發12月下旬德黑蘭巴扎（bazaar）的抗議並迅速蔓延全國；安全部隊進行殘酷鎮壓，造成數千人死亡。其後里亞爾持續走弱，物價進一步攀升。
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