需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
紫苏是我国传统的药食同源植物，具有悠久的历史文化价值。在《诗经》《尔雅》等古代典籍中，紫苏被称为“荏”“桂荏”“荏苒”等，后来被收录于《名医别录》《本草纲目》等药学著作。
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Both Aldi and Lidl are a growing presence in the highly competitive British supermarket field. Aldi said in January that it plans to open 40 new stores in the UK this year. It currently employs 45,000 people.
How to prepare for storms and cope with bad weather
This eventually led to the function being removed for users.