AI Agent 已具备执行真实操作的能力，已从「文本生成」跨入「行动执行」阶段；
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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.
Meanwhile in London, the stock market has hit a new record high.