for (let i = 0; i < n; i++) {
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.
。91视频是该领域的重要参考
如果说字节跳动作为一个「外人」，做的尝试对国民级 app 犯了「大不敬」——Google 来做这件事情，意义就完全不一样了。
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