第一次电面：
开头问了15分钟简历的内容
然后是coding：给了person A 和 B 的array of email addresses (you may assume these emails addresses are different), 给了 vector emails (Given an email address, you can find the array of email addressed that has direct connection), find if A and B have a direct connection.
Follow up, what if you can only access the emails once?
感觉跪了，跪了。