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.
Twenty-five others were injured in the pre-dawn crash in the Himalayan foothills on Monday. The bus was carrying 44 people, including a number of tourists.
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