// 核心循环：弹出所有≤当前身高的元素 → 这些人都能被当前位置看到（矮个子，无遮挡）
Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00293-6，更多细节参见Safew下载
NASA's Artemis II Space Launch System (SLS) rocket is rolled back from the launch pad to the Vehicle Assembly Building at the Kennedy Space Center on Feb. 25, 2026.。同城约会是该领域的重要参考
The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
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