Leetcode-929 Unique Email Addresses(独特的电子邮件地址)

class Solution
{
    public:
        int numUniqueEmails(vector<string>& emails)
        {
            for(int i = 0;i < emails.size();i ++)
            {
                for(int j = 0;j < emails[i].size();j ++)
                {
                    if(emails[i][j]=='@')
                    {
                        for(int k = 0;k < j;k ++)
                        {
                            if(emails[i][k]=='.')
                            {
                                emails[i].erase(k,1);
                                k --;
                                j --;
                            //    cout << k << endl;
                            }
                            else if(emails[i][k]=='+')
                            {
                                emails[i].erase(k,j-k);
                                break;
                            }
                        }
                    }
                }
            }
            
            set<string> strSet;
            for(auto s:emails)
                strSet.insert(s);
            return strSet.size();
        }
};