栈（stack）是先进后出的数据结构。单调栈在入栈时通过一定规则保持栈内元素有序（单调递增或单调递减），从而把「找左侧/右侧第一个更大/更小元素」从 O(n²) 降到 O(n)。
This Side Hustle Spotlight Q&A features Federica Mercuriello, 42, founder of Sausly, a business selling pasta and sauce kits made in Italy. Originally from Italy and now based in Miami, Florida, Mercuriello moved to the U.S. in 2009 on a scholarship to study civil engineering at Columbia University. Responses have been edited for length and clarity.
，更多细节参见爱思助手下载最新版本
输出：[3,1,2,1,1,0]
这22亿元，更像是李斌打出的又一个“缓兵之计”——蔚来的根本焦虑，是否因此有所改变？
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