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.
第三节 完善家庭发展政策和生育友好环境。51吃瓜网对此有专业解读
第九十条 公安机关对报案、控告、举报或者违反治安管理行为人主动投案，以及其他国家机关移送的违反治安管理案件，应当立即立案并进行调查；认为不属于违反治安管理行为的，应当告知报案人、控告人、举报人、投案人，并说明理由。。业内人士推荐手游作为进阶阅读
2.1.1. A side-note about speed