Quadtrees are everywhere spatial data exists. Mapping services use quadtree-like tile pyramids to serve map tiles at different zoom levels (Bing's quadkey system, for example, addresses tiles as base-4 paths). Game engines use them for collision detection and visibility culling. Geographic information systems use spatial indexes to store and query spatial datasets. PostGIS uses GiST indexes (R-tree-style) for spatial queries on geometries, while PostgreSQL's core supports quadtree-like SP-GiST indexes for certain data types like points.
3.6% for some NHS staff in England, including nurses and midwives
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充电线这个原本不起眼的小玩意直接变成了刚需，你家里 3 根，办公室 2 根，车里 1 根，包里还老是要备 1 根。需求蹭蹭就上去了。