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.
Why are Afghanistan and Pakistan fighting?
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Not the day you're after? Here's the solution to yesterday's Mini Crossword.
Feb 2, 2026: Google confirmed the team was still working on the root-cause fix.
第九十六条 需要传唤违反治安管理行为人接受调查的，经公安机关办案部门负责人批准，使用传唤证传唤。对现场发现的违反治安管理行为人，人民警察经出示人民警察证，可以口头传唤，但应当在询问笔录中注明。