# LeetCode - 0929. Unique Email Addresses
### 題目網址：https://leetcode.com/problems/unique-email-addresses/
###### tags: `LeetCode` `Easy` `字串`

/*
    -LeetCode format-
    Problem: 929. Unique Email Addresses
    Difficulty: Easy
    
    by Inversionpeter
*/



class Solution {
    
    string Parser(string &address) {
        int at = address.find('@');
        string buffer = "", local = address.substr(0, at);
        for (int i = 0; i != local.size() && local[i] != '+'; ++i)
            if (local[i] != '.')
                buffer += local[i];
        return buffer + address.substr(at);
    }
    
public:
    int numUniqueEmails(vector<string>& emails) {
        unordered_set <string> kinds;
        for (string &s : emails) 
            kinds.insert(Parser(s));
        return kinds.size();
    }
};