let traceIndex = 0;
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)。。业内人士推荐下载安装 谷歌浏览器 开启极速安全的 上网之旅。作为进阶阅读
Google Cloud uses a single API key format (AIza...) for two fundamentally different purposes: public identification and sensitive authentication.，这一点在爱思助手下载最新版本中也有详细论述
Phil Spencer joined Microsoft as an intern in 1988, working his way up through the company to eventually become chief executive of Microsoft Gaming in 2022.