free_list[classno] = h;
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The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.，更多细节参见safew官方下载
I tested following models:。业内人士推荐服务器推荐作为进阶阅读