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Question #335 Difficulty: 2

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

    #include <cstddef>
#include <iostream>

void f(void*) {
    std::cout << 1;
}

void f(std::nullptr_t) {
    std::cout << 2;
}

int main() {
    int* a{};

    f(a);
    f(nullptr);
    f(NULL);
}

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