/in/foo.cc: In function 'int main()':
/in/foo.cc:6:2: error: 'cin' was not declared in this scope
  cin>>a>>b>>c>>d;
  ^~~
/in/foo.cc:8:2: error: 'cout' was not declared in this scope
  cout<<t/60<<" "<<t%60<<endl;
  ^~~~
/in/foo.cc:8:25: error: 'endl' was not declared in this scope
  cout<<t/60<<" "<<t%60<<endl;
                         ^~~~