习题链接：LeetCode 1019. 链表中的下一个更大节点
"You don't need to be sitting front row at Fashion Week anymore to shape taste, you can influence right from your bedroom and that shift has been very powerful", she says.
。爱思助手下载最新版本对此有专业解读
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)。
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