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Question #42 Difficulty: 2

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

    #include <initializer_list>
#include <iostream>

struct A {
  A() { std::cout << "1"; }

  A(int) { std::cout << "2"; }

  A(std::initializer_list<int>) { std::cout << "3"; }
};

int main(int argc, char *argv[]) {
  A a1;
  A a2{};
  A a3{ 1 };
  A a4{ 1, 2 };
}

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