思路：倒序单调栈。弹出所有 ≤ 当前身高的元素（这些人都能被看到），count 为弹出数量；若栈非空，还能看到栈顶（第一个更高的人），故 +1。能看到的人数 = count + (栈非空 ? 1 : 0)。
In Jersey, Trudi Roscouet said: "Women's health is not a priority for government".
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However, one soft drinks firm in the Midwest is keeping old school tradition alive by continuing to sell its products in returnable glass bottles.
Source: Computational Materials Science, Volume 267