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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，更多细节参见同城约会
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52. 鼓励学生深造日本拟设大学本硕“五年一贯制” - 新华网, www.news.cn/world/20251…
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