What does this C++ snippet output?

1#include <iostream>
2 
3struct A { virtual int who() { return 1; } };
4struct B : A { int who() override { return 2; } };
5struct C : B { int who() override { return 3; } };
6int main() {
7    A* arr[3] = { new A(), new B(), new C() };
8    for (auto p : arr) std::cout << p->who() << " ";
9    std::cout << "\n";
10}