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.
美國移民和海關執法局的執法行動亦屢次引起爭議，去年在洛杉磯的執法和拘捕行動惹起民眾不滿並引發大規模的抗議行動；而今年在明尼阿波利斯的執法行動中，執法人員開槍射殺兩名平民，同樣引來民眾的憤怒及觸發大規模街頭抗議。
。搜狗输入法2026对此有专业解读
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习题链接：LeetCode 581. 最短无序连续子数组