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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More than 800 men have played in an Ashes Test. England picked most of them in the summer of 1989. But the process of selecting the Guardian’s Ashes Top 100 required something more scientific than that infamous shemozzle.。谷歌浏览器【最新下载地址】对此有专业解读
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