MAYBE

We are left with following problem, upon which TcT provides the
certificate MAYBE.

Strict Trs:
  { f(0(x1)) -> s(0(x1))
  , f(s(x1)) -> d(f(x1))
  , d(0(x1)) -> 0(x1)
  , d(s(x1)) -> s(s(d(x1))) }
Obligation:
  innermost runtime complexity
Answer:
  MAYBE

We add following dependency tuples:

Strict DPs:
  { f^#(0(x1)) -> c_1()
  , f^#(s(x1)) -> c_2(d^#(f(x1)), f^#(x1))
  , d^#(0(x1)) -> c_3()
  , d^#(s(x1)) -> c_4(d^#(x1)) }

and mark the set of starting terms.

We are left with following problem, upon which TcT provides the
certificate MAYBE.

Strict DPs:
  { f^#(0(x1)) -> c_1()
  , f^#(s(x1)) -> c_2(d^#(f(x1)), f^#(x1))
  , d^#(0(x1)) -> c_3()
  , d^#(s(x1)) -> c_4(d^#(x1)) }
Weak Trs:
  { f(0(x1)) -> s(0(x1))
  , f(s(x1)) -> d(f(x1))
  , d(0(x1)) -> 0(x1)
  , d(s(x1)) -> s(s(d(x1))) }
Obligation:
  innermost runtime complexity
Answer:
  MAYBE

We estimate the number of application of {1,3} by applications of
Pre({1,3}) = {2,4}. Here rules are labeled as follows:

  DPs:
    { 1: f^#(0(x1)) -> c_1()
    , 2: f^#(s(x1)) -> c_2(d^#(f(x1)), f^#(x1))
    , 3: d^#(0(x1)) -> c_3()
    , 4: d^#(s(x1)) -> c_4(d^#(x1)) }

We are left with following problem, upon which TcT provides the
certificate MAYBE.

Strict DPs:
  { f^#(s(x1)) -> c_2(d^#(f(x1)), f^#(x1))
  , d^#(s(x1)) -> c_4(d^#(x1)) }
Weak DPs:
  { f^#(0(x1)) -> c_1()
  , d^#(0(x1)) -> c_3() }
Weak Trs:
  { f(0(x1)) -> s(0(x1))
  , f(s(x1)) -> d(f(x1))
  , d(0(x1)) -> 0(x1)
  , d(s(x1)) -> s(s(d(x1))) }
Obligation:
  innermost runtime complexity
Answer:
  MAYBE

The following weak DPs constitute a sub-graph of the DG that is
closed under successors. The DPs are removed.

{ f^#(0(x1)) -> c_1()
, d^#(0(x1)) -> c_3() }

We are left with following problem, upon which TcT provides the
certificate MAYBE.

Strict DPs:
  { f^#(s(x1)) -> c_2(d^#(f(x1)), f^#(x1))
  , d^#(s(x1)) -> c_4(d^#(x1)) }
Weak Trs:
  { f(0(x1)) -> s(0(x1))
  , f(s(x1)) -> d(f(x1))
  , d(0(x1)) -> 0(x1)
  , d(s(x1)) -> s(s(d(x1))) }
Obligation:
  innermost runtime complexity
Answer:
  MAYBE

The input cannot be shown compatible

Arrrr..