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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）。
。关于这个话题，im钱包官方下载提供了深入分析
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The Royal Artillery is facing criticism after it emerged they are refusing public access to an “extraordinary object” looted by the British army in the 19th century from the Asante people in modern-day Ghana.