Function Graphs
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王小虎：如果真的想要彻底解决伊朗核问题与政权问题，就必须投入地面部队。如果没有地面部队介入，能否达成目标，我对此持怀疑态度。因此整个事件的核心问题，最终会落到是否投入地面部队上。
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.