Main.cc: In function 'int main()':
Main.cc:3:5: error: 'cin' was not declared in this scope
    3 |     cin>>T;
      |     ^~~
Main.cc:5:5: error: 'cout' was not declared in this scope
    5 |     cout<<endl;
      |     ^~~~
Main.cc:5:11: error: 'endl' was not declared in this scope
    5 |     cout<<endl;
      |           ^~~~