A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
Why hide such a handsome piece of handiwork?
。业内人士推荐快连下载安装作为进阶阅读
Our effect pipeline handles the Success and Failure cases automatically. If a function returns Success, the subsequent function in line will be called. In the case of a Failure, the pipeline terminates.
// 逻辑：count（矮个子数） + （栈非空则+1，代表能看到第一个更高的人；否则+0）