LeetCode-49-Group-Anagrams

[
  ["ate", "eat","tea"],
  ["nat","tan"],
  ["bat"]
]

class Solution {
public:
    vector<vector<string>> groupAnagrams(vector<string>& strs) {
        unordered_map<string,multiset<string>> map_str;
        for(string s:strs){
            string t=s;
            sort(t.begin(),t.end());
            map_str[t].insert(s);
        }
        vector<vector<string>> res;
        for(auto temp:map_str){
            vector<string> vec_str_temp(temp.second.begin(),temp.second.end());
            res.push_back(vec_str_temp);
        }
        return res;
    }
};