Looking at the wider picture, however, mandatory age verification appears to be a growing trend. The UK government's current implementation under the Online Safety Act has come under heavy fire for privacy concerns, while platforms like Discord have received similar critique for their face-scanning age verification efforts, not least because of associations with companies that may not be using the collected data for mere age-confirmation purposes.
* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间），详情可参考heLLoword翻译官方下载
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几天后，类似的情节再次上演。她收到了一条“顺丰快递”的短信，说她的包裹已滞留，让她回拨一个号码处理。她照做了，电话那头又变成了另一个“客服”。这一次，我在旁边听得真切，立刻上前打断，对着话筒严厉呵斥。对方故技重施，瞬间挂断。
Laura CressTechnology reporter，这一点在51吃瓜中也有详细论述
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