The world stopped breathing and watched.
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，详情可参考同城约会
需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
大量标准化编码工作可以自动完成。这意味着，纯粹依赖熟练度/经验建立优势的工程师，价值空间被挤压。
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