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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自主研发成为唯一的选择。兴达公司押注全年利润的七成建设碳杆生产车间，组建起材料学博士领衔的攻坚团队，历时3年突破技术瓶颈，成功实现了关键原材料的自给自足。
Paramount Skydance plans to combine Paramount+ and HBO Max into a single streaming service following the completion of its merger with Warner Bros. Discovery. CEO David Ellison confirmed the plan on an investor call Monday, saying the combined platform would serve over 200 million subscribers and position the company to compete with the biggest players in the streaming space.