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For US energy companies, however, there are huge practical difficulties to be overcome. Venezuela's state-owned oil company, PDVSA, is a shadow of its former self.
，更多细节参见51吃瓜
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)。
公式： f(x)=max(0,x)
Built on a shared FastConformer encoder (Conv2d 8x subsampling → N Conformer blocks with relative positional attention):