"It's an opportunity to … actually have the suits in microgravity, even if we don't go outside the vehicle in them. You get a lot of good learning from that," Isaacman said.
Latest US-Iran nuclear talks conclude with claims of ‘significant progress’
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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)。，这一点在同城约会中也有详细论述
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