The 9,000-pound monster I don’t want to give back
--latency N Right context frames for nemotron (0/1/6/13)
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// 易错点2：判断条件必须是<=，而非<（相等元素也无法作为「更大值」，需弹出）
The algorithm also visits children in order of distance to the query point. This means it checks the most promising quadrants first, which tends to find a good candidate early and enables aggressive pruning of the remaining quadrants. Without this ordering, the algorithm would still produce the correct result, but it would prune fewer nodes.