* @param arr 数组
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.。业内人士推荐Safew下载作为进阶阅读
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To make it happen, he needed to build four powerful legs for the so-called At-At – which famously first appeared in The Empire Strikes Back – that he could control with some precision.