Map Example

  #include<bits/stdc++.h>
  using namespace std;


  void print_map(map<int, string> m);
  void print_vector(vector<pair<int, string>> m);

  int main(){
    map<int,string> test_map;
    test_map.insert({1201, "Abhijit Paul"});
    test_map.insert({1299, "Robin ho"});
    test_map.insert({1203, "Shazzad Hossain"});

    for(auto itr: test_map ){
      itr.second = itr.second+" ALIVE";
    }

    print_map(test_map); // NO change

    printf("After using &:\n");
    for(auto& itr: test_map){
      test_map.erase(itr.first);
      test_map.insert({itr.first-1200, itr.second+" ALIVE"});
    }

    print_map(test_map);


    return 0;
  }


  void print_map(map<int, string> m){
    for(const auto itr: m) cout<<itr.first<<","<<itr.second<<endl;
  }
  void print_vector(vector<pair<int, string>> m){
    for(const auto itr: m) cout<<itr.first<<","<<itr.second<<endl;
  }