arr[j + gap] = key;
The 100 greatest men’s Ashes cricketers of all time
，更多细节参见夫子
Charging case dimensions: 50 x 57.2 x 24.5mm
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.