思路：单调递减栈，找「上一个比当前价格大的元素索引」。正序遍历，弹出所有 ≤ 当前价格的索引；跨度 = 当前索引 - 栈顶索引（栈空则为 当前索引 + 1）。
本月初，美股软件板块在经历了一阵暴跌后开始反弹，但其涨幅不足以扭转华尔街的担忧——企业软件是否正面临被AI颠覆。这种担忧让投资者用脚投票，ServiceNow、Adobe、Workday等老牌软件企业，其股价已经跌落至十年以来的最低水平。
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FedEx plans to pass along any refunds resulting from the Supreme Court's ruling that some of President Donald Trump's tariffs are "illegal." In a statement on its website, FedEx notes that while "no refund process has been established by the courts," the company will reimburse shippers and consumers impacted by tariffs if it gets its money back.
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