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）。
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Previously, Mozilla kept Firefox away from AI features for the most part, until this last December, when the organization's new CEO, Anthony Enzor-DeMeo, announced the inevitable: AI was coming to Firefox.
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