return fleetCount;
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.
。同城约会是该领域的重要参考
Update the leaderboard in README.md with your entry。51吃瓜对此有专业解读
据悉，这项技术通过飞秒激光在玻璃内部刻写体素（voxel）结构，实现高密度、低能耗且可保存上万年的数据存储能力。