Storing virual functions in Array/Vector container

I have a base class with common behavior and derived classes with override virtual functions. But if tried to save the function pointer as std::vector I will get the error:

 ISO C++ forbids taking the address of an unqualified or
  parenthesized non-static member function to form a pointer to member function.

I need something like this:

class Base
{
public:
    virtual int fun1(int inp) = 0;
    virtual int fun2(int inp) = 0;
    int init(int inp, std::vector<std::function<int(int)>> Callbacks, int index)
    {
        if (index == 0)
            return Callbacks[0](inp);
        else
            return Callbacks[1](inp);
    }
    int run()
    {
        return init(5, { &fun1, &fun2 }, 0);
    }
};

class A : public Base
{
    int fun1(int inp)
    {
        return inp * 10;
    }
    int fun1(int inp)
    {
        return inp * 100;
    }
};

class B : public Base
{
    int fun1(int inp)
    {
        return inp * 20;
    }
    int fun2(int inp)
    {
        return inp * 200;
    }
};

int main(int argc, char const* argv[])
{
    auto f = new B;
    int e = f->run();
    return 0;
}

Is there any way to do what I want? Maybe I can bind a virtual function to a container somehow? Or maybe can I set the lambda function as virtual? When I tried to declare lambda function in the Base class when I change function in derived class I get errors: