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。
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。业内人士推荐新收录的资料作为进阶阅读
There are times when it feels as though the entirety of British horse racing exists in a state of perma-gloom, bewailing an ageing fanbase, declining attendances and a moribund, factional leadership. It is, so the narrative goes, a sport in slow but irreversible decline, waiting for the inevitable moment in 10 or 20 years’ time when someone finally comes along to turn out the lights.
TopicXbox leadership falls apart. what happens next with Phil Spencer and Sarah Bond out? – 1:53