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.
OpenAI CEO Sam Altman told his employees in a memo on Thursday that the company would push for the same limitations on autonomous weapons and mass surveillance that Anthropic has, according to Axios.
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（一）刑讯逼供、体罚、打骂、虐待、侮辱他人的；。关于这个话题，搜狗输入法2026提供了深入分析
2025年事实上已经是保单大重写之年；而从2026年开始，企业会逐步发现，自己买到的不是一张覆盖一切的AI风险保单，而是一张更窄、更贵、且附带更多前置条件的可承保风险。本文关心的不是保险公司如何用AI提效，而是反过来，AI如何重写保险的经营范式。风险从可分散变成同源聚合，黑箱把成本先推到辩护费用，责任链条在供应链里漂移。保险会从概率生意走向治理生意，定价权会从精算迁移到审计与红队证据链。