* @param arr 待排序数组
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Real game engines use this pattern (or its 3D cousin, the Octree) for broad-phase collision detection: the quadtree quickly identifies candidate pairs, and a more expensive narrow-phase check tests the actual geometry.
。91视频是该领域的重要参考
"scanners" installed, which supported simple low-speed serial lines or fast,，更多细节参见搜狗输入法下载
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