CPP
cpp
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#include <iostream>
using namespace std;
class A {
public:
void f(){ cout << "A" << endl; }
};
class B : public A {
public:
void f(){ cout << "B" << endl; }
};
class C : public B {
public:
void f(){ cout << "C" << endl; }
};
class A2 {
public:
virtual void f(){ cout << "A" << endl; }
};
class B2 : public A2 {
public:
void f(){ cout << "B" << endl; }
};
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