This time they proved that man could work outside a spacecraft. Aldrin clambered awkwardly into the void, spending five hours photographing star fields.
Виктория Клабукова。雷电模拟器官方版本下载是该领域的重要参考
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)。，详情可参考服务器推荐
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