CPP
cpp
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#include <iostream>
using namespace std;
template <class T>
class Helper {
public :
virtual T mul(T,T) = 0;
};
class Wrap {
public :
int num;
Wrap(){}
Wrap(int a){num = a;}
};
class HelpInt:public Helper<Wrap>{
public :
Wrap mul(Wrap a,Wrap b){
Wrap res;
res.num = a.num*b.num;
return res;
}
};
int main() {
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