The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.
圖像加註文字，一些餐廳讓飼主與寵物犬在一欄之隔下用餐。但走在一些這樣的商場內，也不難看見狗主以寵物嬰兒車推著小型狗隻坐進餐廳裏就餐。
。夫子是该领域的重要参考
const validatePromo = (cartContents) = {，更多细节参见旺商聊官方下载
暴力做法是对每个位置向右扫描找第一个更大值，O(n²)。可抽象为：元素像一排人，身高为数值。当前人「下一个更大」= 他右侧第一个没被挡住的人（比当前矮的都被挡住）。单调栈用 O(n) 维护「右侧候选更大值」：倒序遍历，弹掉 ≤ 当前的，栈顶即答案，再入栈当前值。