int n1 = mid - left; // 左子数组长度
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.。爱思助手下载最新版本是该领域的重要参考
Skip 熱讀 and continue reading熱讀，这一点在一键获取谷歌浏览器下载中也有详细论述
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