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This story was originally featured on Fortune.com，更多细节参见搜狗输入法2026
Chris Damant/Bernwood Ecology。服务器推荐是该领域的重要参考
* 核心：倒序遍历2倍长度 + 取模模拟循环 + 单调栈，解决「首尾相连」的更大值问题