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，详情可参考heLLoword翻译官方下载
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.
Greater Than (4): Everything in this space must be greater than 4. The answer is 5-3, placed vertically.