Фото: Mindaugas Kulbis / AP
// Nothing stops you from doing this
。safew官方下载对此有专业解读
The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
从“十五五”规划建议提出“持续巩固拓展脱贫攻坚成果”，到2026年中央一号文件明确提出“实施常态化精准帮扶”，着眼的正是确保长久守住不发生规模性返贫致贫底线。