需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
除夕当晚，我们去了四川德阳灯会，现场还有歌舞和打铁花表演。南方周末记者 黄思卓/摄
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The solution is trap-and-emulate, the same principle later generalized in hardware virtualization extensions. V86 mode adds a special rule: since V86 tasks always run at CPL=3, if the OS sets IOPL
shadcn/ui over MUI
You can set up Privacy Display to activate when you're asked for a password or PIN, or when you get a notification or open certain apps. So if (for instance) you tend to look at your banking apps when you’re on public transit and don’t want other passengers to see how much moolah you have, Privacy Display seems like a very handy feature.