需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
结合一位资深职业加盟商的总结，这种困境的出现，主要源于三个致命陷阱，也是很多门店最终闭店的关键原因：，这一点在WPS官方版本下载中也有详细论述
。关于这个话题，雷电模拟器官方版本下载提供了深入分析
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McKenzie will be based at BAS's headquarters in Cambridge for the remainder of the year, but he has previously overwintered in Antarctica. "When the winter comes, you feel this incredible sense of freedom as most people leave," he says.