需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
Mr Duffy's comments about the potential for China and Russia to potentially "declare a keep-out zone" on the Moon appear to be referring to an agreement called the Artemis accords.。服务器推荐对此有专业解读
&& mkdir -p /home/${USERNAME} \。关于这个话题，safew官方下载提供了深入分析
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