// 步骤1：将链表值提取到数组中（链表无法随机访问，转数组更易处理）
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。关于这个话题，safew官方版本下载提供了深入分析
If the subject line of the email is irrelevant to customers, they will ignore it multiple times. But, if it keeps repeating, they are intercepted and unsubscribed from your emails. So, send relevant emails for the benefit of the customer. Don't send emails that often only focus on sales, offers and discounts.，推荐阅读同城约会获取更多信息
The sudo is necessary depending on your choice in the next step.