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Question #231 Difficulty: 2

According to the C++17 standard, what is the output of this program? 

    #include <iostream>

struct override {};

struct Base {
    virtual override f() = 0;
};

struct Derived : Base {
    virtual auto f() -> override override{
        std::cout << "1";
        return override();
    }
};

int main() {
    Derived().f();
}

Answer:

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