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Question #122 Difficulty: 3

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

    #include <iostream> 

typedef long long ll;

void foo(unsigned ll) {
    std::cout << "1";
}

void foo(unsigned long long) {
    std::cout << "2";
}

int main() {
    foo(2ull);
}

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