text: #include<iostream>
  #include<unordered_map>
  #include<vector>
  using namespace std;
  
  int main()
  {
      unordered_map<string,vector<string>> phonebook;
      phonebook["Rahul"].push_back("9110");
      phonebook["Rahul"].push_back("9210");
      phonebook["Rahul"].push_back("9310");
      phonebook["Kamal"].push_back("8110");
      phonebook["Kamal"].push_back("8210");
      phonebook["Kamal"].push_back("8310");
  
      for(auto p:phonebook){
          cout<<"Name : " <<p.first<<" ->";
          for(string s:p.second){
              cout<<s<<" ,";
          }
          cout<<endl;
      }
  
      return 0;
  }