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。
; IRETD — check if returning to V86 mode
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Indonesia has freed and deported a US man after he spent 11 years in prison for the premeditated murder of his then girlfriend’s mother on the tourist island of Bali, and he will now faces federal charges in the US.。关于这个话题，91视频提供了深入分析
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