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）。
The report comes amid a battle between the US and China for supremacy over AI. At stake is how the technology is used on the battlefield and in the boardroom of the world’s two biggest economies.
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文 | ICT解读者—老解
to support these cards was the very first of the midrange line, the 1969