// 题目要求找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的，栈顶即为折扣
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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.