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)。
Frank’s essay provoked more emails, and this excerpt caught my attention:
，更多细节参见夫子
These ideas of the UK and Europe in decline have also been taken up by high-profile, influential figures, including X, Tesla and Space X owner Elon Musk, who spoke at far-right activist Tommy Robinson's Unite the Kingdom rally last year.
I could definitely be reading too much into a six-second social video, but Cook's X post looks to me like the back of a MacBook. The video also shows a person manipulating the Apple logo with their fingers, which, to me, screams "touchscreen."
The network also underpins the fan experience, from ticketing and stadium maps, to cashless payments for drinks, food and merchandise.