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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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ВСУ атаковали Донецк новым видом американского БПЛАВСУ впервые атаковали Донецк новым видом американского БПЛА。体育直播是该领域的重要参考
Last week, the financial technology company Block announced that it would lay off 4,000 of its 10,000 workers. Dorsey, Block’s CEO, said in a letter to shareholders that advances in AI “have changed what it means to build and run a company”.