以下C++代码运行后的输出结果是？
#include <iostream>
using namespace std;
class Animal {
public:
virtual void speak() {
cout << "Animal speak" << endl;
}
};
class Dog : public Animal {
public:
void speak() {
cout << "Wang Wang" << endl;
}
};
int main() {
Animal* p = new Dog();
p->speak();
delete p;
return 0;
}
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