C++, very simple, 28 ms, faster than 93.92%
\nclass Solution {\npublic:\n    int numUniqueEmails(vector<string>& emails) {\n        set<string> ans;\n        for(int i=0;i<emails.size();i++){\n           
```\nclass Solution {\npublic:\n    int numUniqueEmails(vector<string>& emails) {\n        set<string> ans;\n        for(int i=0;i<emails.size();i++){\n            string s="";\n            int pos=emails[i].find("@");\n            string sub=emails[i].substr(pos);\n            for(char x:emails[i]){                \n                if(x==\'.\')continue;\n                if(x==\'+\'||x==\'@\')break;\n                s.push_back(x);                \n            }\n            s+=sub;\n            ans.insert(s);\n        }\n        return ans.size();\n    }\n};\n```
['C']