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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前不久，一则公开通报引发警醒：辽宁省鞍山市海城市花费高额费用向某“百强县”榜单评价机构购买咨询服务，该机构帮助其实现榜单进位。
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资本市场当下“精神分裂”式的定价，恰恰暴露了这一焦虑的本质。
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