Russell Brandom
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Base image: Intel 80386 DX die, Wikimedia Commons。同城约会是该领域的重要参考
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.