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)。
systems. In a previous career, I worked at a Federal Reserve bank, where
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2017年，完美日记横空出世，精准踩中了国货崛起、社交电商爆发、彩妆渗透率快速提升三重时代红利，走出了一条堪称教科书级别的网红品牌增长路径。
"We did share last quarter that memory and storage costs made up roughly 15 percent to 18 percent of our PC bill of materials, and we now currently estimate this to be roughly 35 percent for the year," said CFO Karen Parkhill on the company's latest earnings call. She also confirmed that part of the company's response will be price increases. Samsung similarly warned of potential price increases due to AI-induced memory shortages.