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.
咱们结合上面的例子，看看底层发生了什么。，这一点在体育直播中也有详细论述
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