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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1997年4月，时任福建省委副书记的习近平同志赴宁夏西海固进行扶贫考察。“真正触动我对扶贫下那么大的决心，除了自己的经历，就是看了西海固。”
SSH key pair (defaults to ~/.ssh/id_ed25519)