（一）已满十四周岁不满十六周岁的；
In the world of highly-polished content on social media sites such as Instagram and as content feels increasingly automated, "people look for signals of lived experience, disagreement and nuance", says Oc.
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“The notion that this was a playful snowball fight obviously is not true,” Patrick Hendry, a police union president, told reporters after the proceeding. “This was an attack on the uniform that these police officers wear so proudly every day. They came after these police officers, pelting them with ice, rocks.”
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)。