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.
// 复制剩余元素（只需复制左数组剩余，右数组已在原位置）
。关于这个话题，同城约会提供了深入分析
2026-02-28 00:00:00:0 国家水网覆盖率超八成，农村自来水普及率达96%
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