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2. 从个位开始，对每位进行计数排序（稳定排序）
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Quadtree-based image compression formats and level-of-detail systems all work this way. Satellite imagery, terrain rendering, and geographic information systems use quadtree decomposition to serve data at varying resolutions: zoomed out, you see large coarse blocks; zoomed in, you see fine-grained tiles. The same principle extends to three dimensions (octrees) for volume rendering and 3D spatial indexing.
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Security researchers claim Persona, the provider behind Discord's UK age verification 'experiment', performs '269 individual verification checks' on user data, including those for terrorism and espionage