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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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The payments totalled £29.8m, funded by the UK government and paid separately from the Crawford contract.
The global open-source community shares many parallels with how the best