printf 'Opluscam sha1sum=%s\n' "$mysha" &&
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。
"Because of Iran's threats, the strait is effectively closed," Homayoun Falakshahi from Kpler told BBC News.，更多细节参见爱思助手
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。电影是该领域的重要参考
The best AirPods 4 deals，更多细节参见电影
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