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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)。
。体育直播是该领域的重要参考
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Kennedy is among the many social media influencers who have launched business models that are not dependent on the platforms—Instagram, TikTok—that fueled their rise. Influencers can fall into the trap of essentially being “Uber drivers for Instagram or TikTok,” says Sean Branagan, director of the Center for Digital Media Entrepreneurship at Syracuse University. “You’re waiting for the assignment and the money; you’re not in control of where your business is going.” Kennedy has monetized her social media following by creating an affinity group—rather than seeking mass appeal—and she “cares for, stimulates, and advances” her audience with her paid offerings, Branagan says. “What she has is a magic potion, and it’s about more than her face and name.”