需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
Фото: Виталий Тимкив / РИА Новости
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Descending into the windowless basement of a second world war air-raid bunker built for civilians in central Berlin is arguably an eerie enough evocation of what it means to endure life in a conflict.
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