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.
本次交易共包括4座在产金矿，具体为：位于巴西东北部马拉尼昂州的Aurizona 金矿、东部巴伊亚州的Bahia综合体（包括Fazenda金矿与Santa Luz金矿），以及东南部米纳斯吉拉斯州的RDM金矿。
。业内人士推荐WPS下载最新地址作为进阶阅读
count[arr[i] - min]++;
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