需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
[qjoly@fedora]~% sudo bootc switch harbor.cortado.thoughtless.eu/bootc/server:add-nginx，详情可参考快连下载-Letsvpn下载
When North Korea’s ruling party held a top-level meeting this month there were predictable boasts of unstoppable nuclear development and, more unexpectedly, a suggestion by Kim Jong-un that his country and the US “could get along” – provided that Washington recognised North Korea as a legitimate nuclear power.，推荐阅读51吃瓜获取更多信息
come back and withdraw money, a different teller writes up a different slip. At