Set Example

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


void print(map<int, string> m);
void print(vector<pair<int, string>> m);
void print(set<pair<int, string>> m);

int main(){
  set<pair<int,string>> test_set;
  test_set.insert({1201, "Abhijit Paul"});
  test_set.insert({1202, "Sazzad Hossain"});
  test_set.insert({1203, "Shazzad Hossain"});
  test_set.insert({1230, "Arnab Banik"});

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

  print(test_set); // NO change

  printf("After using &:\n");
  /* for(auto& itr: test_set ){
    itr.first = itr.first-1200; // ERROR HERE
    itr.second = itr.second+" ALIVE"; // ERROR HERE
    }*/

  for(auto& itr: test_set ){
    test_set.erase(itr);
    test_set.insert({itr.first-1200, itr.second+" ALIVE"});
  }

  print(test_set);


  return 0;
}


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



#+end_src