YES
O(n^2)
TRS:
 {f(s(x)) -> s(s(g(x))),
   f(0()) -> s(0()),
  g(s(x)) -> f(x),
   g(0()) -> 0()}
 Natural interpretation:
  Strict:
   {f(s(x)) -> s(s(g(x))),
     f(0()) -> s(0()),
    g(s(x)) -> f(x),
     g(0()) -> 0()}
  Weak:
   {}
  Interpretation class: deltarestricted
  [0](delta) = + 0 + 0*delta
  [s](delta, X0) = + 1*X0 + 1 + 0*X0*delta + 0*delta
  [g](delta, X0) = + 1*X0 + 0 + 1*X0*delta + 1*delta
  [f](delta, X0) = + 1*X0 + 1 + 1*X0*delta + 1*delta
  
  s_tau_1(delta) = delta/(1 + 0 * delta)
  g_tau_1(delta) = delta/(1 + 1 * delta)
  f_tau_1(delta) = delta/(1 + 1 * delta)
  
  Qed