Process (Ring-2.5-1T): 开启深度思考模式，进行需求拆解、逻辑推演、架构设计。
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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