class Person 
{ 
  int _AA; 
}; 
class Student:public Person 
{ 
  int _BB; 
}; 
class Teacher :public Person 
{ 
  int _CC; 
}; 
class Assistant :public Student, public Teacher 
{ 
  int _DD; 
}; 

#include<iostream> 
using namespace std; 
 
class AA 
{ 
public: 
  string _aa; 
}; 
class BB :public AA 
{ 
public: 
  int _bb; 
}; 
class CC :public AA 
{ 
public: 
  int _cc; 
}; 
class DD :public BB, public CC 
{ 
public: 
  int _dd; 
}; 
 
int main() 
{ 
  DD d; 
  d.BB::_aa = 1; 
  d.CC::_aa = 2; 
  d._bb = 3; 
  d._cc = 4; 
  d._dd = 5; 
  cout << sizeof(d) << endl; 
  return 0; 
} 

#include<iostream> 
using namespace std; 
 
class AA 
{ 
public: 
  string _aa; 
}; 
class BB :<span style="color:#FF0000;">virtual</span> public AA 
{ 
public: 
  int _bb; 
}; 
class CC :<span style="color:#FF0000;">virtual</span> public AA 
{ 
public: 
  int _cc; 
}; 
class DD :public BB, public CC 
{ 
public: 
  int _dd; 
}; 
 
int main() 
{ 
  DD d; 
  d.BB::_aa = 1; 
  d.CC::_aa = 2; 
  d._bb = 3; 
  d._cc = 4; 
  d._dd = 5; 
  cout << sizeof(d) << endl; 
  return 0; 
}