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// Stateless transform — a pure function，详情可参考快连下载安装
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。
12月24日，北京奥林匹克公园龙形水系，不少市民在湖面上滑冰。本版摄影/新京报记者 王子诚