需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
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Wonderfall (@w0nderfall)
Цены на нефть взлетели до максимума за полгода17:55。业内人士推荐WPS下载最新地址作为进阶阅读
For implementers, there's no Transformer protocol with start(), transform(), flush() methods and controller coordination passed into a TransformStream class that has its own hidden state machine and buffering mechanisms. Transforms are just functions or simple objects: far simpler to implement and test.