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)。
In his simulations, it was extremely rare for someone to have their mutual first picks; but many people had those that were second or third picks. In this scenario a couple counts as happy if each is near the top of the other's list and neither can find someone they and that other person would both prefer more.，这一点在im钱包官方下载中也有详细论述
“我忏悔，我自放假回家以来就没打开过书包”“我忏悔，连续三天吃螺蛳粉熏哭室友”“我忏悔，绩点崩盘、实习被拒”……一段段匿名文字，刷屏式的情绪共鸣，深夜里的真诚袒露，让“赛博忏悔室”成为数字时代一个隐秘而柔软的精神角落。。一键获取谷歌浏览器下载对此有专业解读
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