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Question #338 Difficulty: 3

According to the C++23 standard, what is the output of this program? 

    #include <type_traits>
#include <iostream>
#include <string>

template<typename T>
int f()
{
    if constexpr (std::is_same_v<T, int>) { return 0; }
    else { return std::string{}; }
}

int main()
{
    std::cout << f<int>();
}

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