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.
Медведев вышел в финал турнира в Дубае17:59
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观此不伦不类之春联，即便其拥财亿万无计数，亦可知不过造化所戏弄之人，升斗胸量，鸡虫之见。
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The Pentagon is in a standoff with another prominent AI company, Anthropic, over the use of its AI model. Defense Secretary Pete Hegseth has given Anthropic CEO Dario Amodei a Friday deadline to comply with demands to peel back safeguards on its AI model or risk losing a lucrative Pentagon contract.