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.
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OPPO Find N6 将支持 AI 手写笔，这一点在搜狗输入法2026中也有详细论述
These debt-funded projects create “indirect but potentially material” exposure to fiscal risk, the analysts wrote. Beyond infrastructure, governments will have to plan for labor disruptions and related social support. The IMF estimates 40% of global jobs—and 60% in advanced economies—are exposed to AI, particularly high-skill roles, potentially eroding payroll taxes while spiking demand for reskilling and safety nets.