BBC事實查核（BBC Verify） 對這些說法進行了核實。
But when the platform announced it would soon require some users to verify their age, Alastair was among those concerned about its implications for their data - and that of their online communities.
。关于这个话题，下载安装 谷歌浏览器 开启极速安全的 上网之旅。提供了深入分析
方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」
// 易错点1：条件写反（比如写成cur）→ 栈逻辑完全错误，无法找到上一个更大值