YES
O(n^2)
TRS:
 {
     g(empty(), d) -> d,
  g(cons(x, k), d) -> g(k, cons(x, d)),
     f(a, empty()) -> g(a, empty()),
  f(a, cons(x, k)) -> f(cons(x, a), k)
 }
 Natural interpretation:
  Strict:
   {
       g(empty(), d) -> d,
    g(cons(x, k), d) -> g(k, cons(x, d)),
       f(a, empty()) -> g(a, empty()),
    f(a, cons(x, k)) -> f(cons(x, a), k)
   }
  Weak:
   {}
  Interpretation class: deltarestricted
  [cons](delta, X1, X0) = + 1*X0 + 0*X1 + 2 + 0*X0*delta + 2*X1*delta + 0*delta
  [f](delta, X1, X0) = + 1*X0 + 1*X1 + 0 + 3*X0*delta + 2*X1*delta + 0*delta
  [empty](delta) = + 2 + 2*delta
  [g](delta, X1, X0) = + 1*X0 + 1*X1 + 0 + 0*X0*delta + 2*X1*delta + 0*delta
  cons_tau_1(delta) = delta/(0 + 2 * delta)cons_tau_2(delta) = delta/(1 + 0 * delta)
  f_tau_1(delta) = delta/(1 + 2 * delta)f_tau_2(delta) = delta/(1 + 3 * delta)
  
  g_tau_1(delta) = delta/(1 + 2 * delta)g_tau_2(delta) = delta/(1 + 0 * delta)
  
  Qed