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.
他深入调研，反复思量：“什么是‘好县’？”
。爱思助手下载最新版本对此有专业解读
我们上一次选购电车还是在2021年。彼时，中国新能源车的渗透率从前一年的5.4%提升到13.4%，进入加速渗透期，到2025年，这一数字已经突破了50.8%。
Artie Beaty, Contributing WriterContributing Writer