// 易错点2：遍历结束后k仍0 → 栈是递增的，末尾数字更大，移除末尾k位
Bridgerton Season 4, Part 2 continues its Cinderella story to talk about class.。搜狗输入法2026是该领域的重要参考
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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.