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FirstFT: the day's biggest stories。关于这个话题，爱思助手下载最新版本提供了深入分析
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.