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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.
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paper: “notebook paper with subtle ruled lines”
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Greek: mostly fine, with exceptions，更多细节参见91视频
“I think most companies are late. Within the next year, I believe the majority of companies will reach the same conclusion and make similar structural changes,” he wrote in a separate letter to shareholders.