习题链接：LeetCode 1475. 商品折扣后的最终价格
Photograph: Julian Chokkattu，更多细节参见safew官方版本下载
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.，更多细节参见51吃瓜
Раскрыты подробности похищения ребенка в Смоленске09:27
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