// 第一步：倒序遍历nums2，用单调栈计算每个元素的下一个更大值
Daniel Adams, Usdaw's national officer, said: "It remains incredibly disappointing that, while the company still performs strongly, it continues to make decisions like this.
，更多细节参见safew官方版本下载
定存什么：要下标/距离就栈里存索引，只要值就存值或存索引再 nums[i] 取。
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