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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// 易错点：升序排序会导致逻辑完全错误（无法判断后车是否追前车）
5️⃣ 归并排序 (Merge Sort)
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近期，英国渣打银行等国际机构上调2026年中国GDP增长预期，主要依据之一是认为中国全要素生产率将持续提升。