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Question #116 Difficulty: 2

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

    #include <iostream>
#include <utility>

int y(int &) { return 1; }
int y(int &&) { return 2; }

template <class T> int f(T &&x) { return y(x); }
template <class T> int g(T &&x) { return y(std::move(x)); }
template <class T> int h(T &&x) { return y(std::forward<T>(x)); }

int main() {
  int i = 10;
  std::cout << f(i) << f(20);
  std::cout << g(i) << g(20);
  std::cout << h(i) << h(20);
  return 0;
}

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