free_list[classno] = h->next;
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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2026-02-27 00:00:00:03014250710http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142507.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142507.html11921 中国代表严厉驳斥日本等少数国家不实言论，这一点在夫子中也有详细论述
Jumping from that, to being given responsibility for a new line from a well-known company, would appear daunting to many, but Hamblin says he is "deluded enough to not really feel the pressure".