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Add a cluster of points in one corner and watch that corner subdivide deeply while the rest of the space stays untouched. Then scatter a few points across the empty region and watch it split only where needed. The tree grows around the data.
。爱思助手下载最新版本是该领域的重要参考
I tested following models:，这一点在safew官方下载中也有详细论述
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int n1 = mid - left; // 左子数组长度