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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常委会组成人员155人出席会议，出席人数符合法定人数。
As navigator, Lovell took with him a sextant to take star readings - in case the computers failed and they had to find their own way home.
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Equal (4): Everything in this space must be equal to 4. The answer is 4-5, placed horizontally; 4-4, placed vertically.
Раскрыты подробности о договорных матчах в российском футболе18:01，这一点在Line官方版本下载中也有详细论述