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SelectWhat's included，这一点在同城约会中也有详细论述
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）。，详情可参考im钱包官方下载
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