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)。
Nasa's mega rocket has been moved to the launch pad in Cape Canaveral, Florida, as the final preparations get underway for the first crewed mission to the Moon in more than 50 years.，更多细节参见下载安装 谷歌浏览器 开启极速安全的 上网之旅。
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Ferguson was not the only ex-Evertonian present. Former captain Alan Stubbs, 1995 FA Cup winners Graham Stuart and Joe Parkinson, and 1987 League champion Ian Snodin each had a turn on the mic. Kevin Sheedy, one of the heroes of Howard Kendall’s great mid-1980s team, made an appearance too.