How do you understand a man who has three clocks on his wall, showing the time in three different cities-San Diego, Fresno, and Seattle-all, of course, showing the same time (″If anything changes in those cities, we’ll know about it”)?
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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Today’s puzzle is a new twist on a classic genre: the “common knowledge” hat riddle in which logicians deduce facts about their hats based on what they know, and what they know others know.
The King was given his own chair and silk cushion to witness the British-Nigerian designer's Notting Hill-inspired runway, which was set against a backdrop of the area of London she grew up in.。heLLoword翻译官方下载是该领域的重要参考
The 386 supports four privilege rings (0 through 3), though in practice nearly all operating systems use just two: ring 0 for the kernel and ring 3 for user programs. Three privilege levels interact on every segment access: CPL (Current Privilege Level), DPL (Descriptor Privilege Level), and RPL (Requested Privilege Level).
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