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.
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I asked a more data-science-oriented followup prompt to test Opus 4.5’s skill at data-sciencing:，推荐阅读WPS官方版本下载获取更多信息
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"And even if they go elsewhere, it's always the most shows, or the best shows in London. So if you're Northern, it's not great."