await chat.addQuery(Message.text(text: userInput, isUser: true));
"That's a pretty sacred space," he says. "We only know those things because they've let us be there."，详情可参考91视频
* 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，这一点在safew官方下载中也有详细论述
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