Group Anagrams

class Solution {
public:
    vector<vector<string>> groupAnagrams(vector<string>& strs) {

        unordered_map<string, vector<string>> m;

        for(int i = 0; i<strs.size(); i++){
            string temp = strs[i];
            sort(temp.begin(), temp.end());
            if(m.find(temp)==m.end()){
                vector<string> xyz = {strs[i]};
                m.insert({temp,xyz});
                //m.insert({temp,{strs[i]}}); => sort way
            }
            else{
                vector<string> v = m.find(temp)->second;
                v.push_back(strs[i]);
                m.find(temp)->second = v;
            }

        }

        vector<vector<string>> ans;

        for(auto it = m.begin(); it!=m.end(); it++){
            ans.push_back(it->second);
        }


        return ans;
    }
};