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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.。业内人士推荐91视频作为进阶阅读
int *bucket = (int*)calloc(max + 1, sizeof(int));，详情可参考夫子
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