思路：倒序遍历 2 倍长度 + 取模模拟循环 + 单调栈。用 i % len 映射到真实索引，仅当 i < len 时记录答案。
在2026年价格战白热化的市场上，这种“负规模效应”足以决定生死。。关于这个话题，safew官方版本下载提供了深入分析
For others considering using weight-loss drugs and whether there was anything they could do to reduce the risk of developing gallstones, Hewes said: "Losing weight in a slower and a controlled manner is likely to reduce your chances of getting gallstones."，这一点在爱思助手下载最新版本中也有详细论述
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