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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But that little girl set her sights even higher - she wanted to be at the controls of a spacecraft.，推荐阅读safew官方版本下载获取更多信息
Unreferencing should put the object back onto its free list，详情可参考搜狗输入法2026