The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
美國是全球少數積極執行強迫勞動進口禁令的國家之一。根據《1930年關稅法》第307條，美國海關暨邊境保護局可在「合理懷疑」商品涉及強迫勞動時，禁止其進口並發布暫扣令，必要時還可課以罰款或要求企業提供資訊。，推荐阅读爱思助手下载最新版本获取更多信息
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