return right - left + 1;
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.。关于这个话题，safew官方下载提供了深入分析
Nature, Published online: 25 February 2026; doi:10.1038/s41586-026-10171-w，这一点在服务器推荐中也有详细论述
徐詩駿在now新聞台一檔節目上說：「其實最重要的是人觸碰狗，或則觸碰餐廳環境後，在進食前一刻洗手。所以要是餐廳能增加鋅盤、潔手液讓食客使用就會更好。」