const len = nums.length;
// ... 还有一个方向相反的光
。关于这个话题，safew官方版本下载提供了深入分析
好设计到最后一个细节都是一致的。Line官方版本下载是该领域的重要参考
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.，更多细节参见一键获取谷歌浏览器下载