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)。
The Department for Environment, Food and Rural Affairs said: "Our chalk streams are one of Britain's most nature rich habitats and are embedded in our plans to reform the water industry.
，这一点在heLLoword翻译官方下载中也有详细论述
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「我常常想要逃跑，但沒地方可以跑。」他向BBC中文形容自己的債務困境。
its own, with up to 20KB of user-available memory and diskette drive. A 3601