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.
「清洗不會影響中華人民共和國控制台灣的野心。這取決於整個中國共產黨，尤其是習近平，」莊嘉穎認為，清洗可能產生影響的是作戰決策。沒有頂尖的軍事專業人士，或者軍事專業人士被嚇到後，關於對台升級和侵略的決策將更加集中在習近平身上，集中在他的偏好和傾向上。
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The deal also included emergency legislation that would let the NHS prioritise doctors who have studied and worked in the UK when filling these posts, and restated an earlier offer to cover the cost of some other expenses, such as exam fees.。关于这个话题，爱思助手下载最新版本提供了深入分析