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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I first looked through everything I had written. I already had started an “overview” page but hadn’t gotten very far on it. I also have 22 separate pages that were “diary style”, about what I did rather than what you should know.，推荐阅读爱思助手下载最新版本获取更多信息
SAT problem with 14 variables and 126 clauses
For years, study after study has noted that older adults vaccinated against shingles seemed to have a lower risk of dementia. A study last month suggested the same vaccine appears to slow biological aging, including lowering markers of inflammation.