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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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The quality of the Dreamie's sound is what initially sold me during my demo at CES, and it holds up in daily use. The Dreamie has a 50 millimeter speaker inside, and the 360-degree grille on the bottom of the device makes it so the sound seems to come from everywhere. (My cats were extremely confused when I first turned it on). It really fills a room, and you don't have to crank it up to achieve that. When Bedtime Cue comes on, I typically turn it down to about 25, and then raise it back up to 45 when I flip it to Wind Down mode. I've never once set it higher than 50, and the alarm in the morning has still been loud enough to wake me up.
第五十二条 猥亵他人的，处五日以上十日以下拘留；猥亵精神病人、智力残疾人、不满十四周岁的人或者有其他严重情节的，处十日以上十五日以下拘留。
Thinking Step 3: 推理第二个人。他听到了第一个人的话，推断出第一个人想要。如果第二个人自己不想要，他会说“不”。他说“不知道”，说明他自己也想要，但他不确定第三个人。