MAYBE

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

Strict Trs:
  { nthtail(n, l) -> cond(ge(n, length(l)), n, l)
  , cond(true(), n, l) -> l
  , cond(false(), n, l) -> tail(nthtail(s(n), l))
  , ge(u, 0()) -> true()
  , ge(s(u), s(v)) -> ge(u, v)
  , ge(0(), s(v)) -> false()
  , length(nil()) -> 0()
  , length(cons(x, l)) -> s(length(l))
  , tail(nil()) -> nil()
  , tail(cons(x, l)) -> l }
Obligation:
  runtime complexity
Answer:
  MAYBE

None of the processors succeeded.

Details of failed attempt(s):
-----------------------------
1) 'WithProblem (timeout of 60 seconds)' failed due to the
   following reason:
   
   Computation stopped due to timeout after 60.0 seconds.

2) 'Best' failed due to the following reason:
   
   None of the processors succeeded.
   
   Details of failed attempt(s):
   -----------------------------
   1) 'WithProblem (timeout of 30 seconds) (timeout of 60 seconds)'
      failed due to the following reason:
      
      Computation stopped due to timeout after 30.0 seconds.
   
   2) 'Best' failed due to the following reason:
      
      None of the processors succeeded.
      
      Details of failed attempt(s):
      -----------------------------
      1) 'bsearch-popstar (timeout of 60 seconds)' failed due to the
         following reason:
         
         The processor is inapplicable, reason:
           Processor only applicable for innermost runtime complexity analysis
      
      2) 'Polynomial Path Order (PS) (timeout of 60 seconds)' failed due
         to the following reason:
         
         The processor is inapplicable, reason:
           Processor only applicable for innermost runtime complexity analysis
      
   
   3) 'Fastest (timeout of 5 seconds) (timeout of 60 seconds)' failed
      due to the following reason:
      
      None of the processors succeeded.
      
      Details of failed attempt(s):
      -----------------------------
      1) 'Bounds with perSymbol-enrichment and initial automaton 'match''
         failed due to the following reason:
         
         match-boundness of the problem could not be verified.
      
      2) 'Bounds with minimal-enrichment and initial automaton 'match''
         failed due to the following reason:
         
         match-boundness of the problem could not be verified.
      
   

3) 'Innermost Weak Dependency Pairs (timeout of 60 seconds)' failed
   due to the following reason:
   
   We add the following weak dependency pairs:
   
   Strict DPs:
     { nthtail^#(n, l) -> c_1(cond^#(ge(n, length(l)), n, l))
     , cond^#(true(), n, l) -> c_2(l)
     , cond^#(false(), n, l) -> c_3(tail^#(nthtail(s(n), l)))
     , tail^#(nil()) -> c_9()
     , tail^#(cons(x, l)) -> c_10(l)
     , ge^#(u, 0()) -> c_4()
     , ge^#(s(u), s(v)) -> c_5(ge^#(u, v))
     , ge^#(0(), s(v)) -> c_6()
     , length^#(nil()) -> c_7()
     , length^#(cons(x, l)) -> c_8(length^#(l)) }
   
   and mark the set of starting terms.
   
   We are left with following problem, upon which TcT provides the
   certificate MAYBE.
   
   Strict DPs:
     { nthtail^#(n, l) -> c_1(cond^#(ge(n, length(l)), n, l))
     , cond^#(true(), n, l) -> c_2(l)
     , cond^#(false(), n, l) -> c_3(tail^#(nthtail(s(n), l)))
     , tail^#(nil()) -> c_9()
     , tail^#(cons(x, l)) -> c_10(l)
     , ge^#(u, 0()) -> c_4()
     , ge^#(s(u), s(v)) -> c_5(ge^#(u, v))
     , ge^#(0(), s(v)) -> c_6()
     , length^#(nil()) -> c_7()
     , length^#(cons(x, l)) -> c_8(length^#(l)) }
   Strict Trs:
     { nthtail(n, l) -> cond(ge(n, length(l)), n, l)
     , cond(true(), n, l) -> l
     , cond(false(), n, l) -> tail(nthtail(s(n), l))
     , ge(u, 0()) -> true()
     , ge(s(u), s(v)) -> ge(u, v)
     , ge(0(), s(v)) -> false()
     , length(nil()) -> 0()
     , length(cons(x, l)) -> s(length(l))
     , tail(nil()) -> nil()
     , tail(cons(x, l)) -> l }
   Obligation:
     runtime complexity
   Answer:
     MAYBE
   
   We estimate the number of application of {4,6,8,9} by applications
   of Pre({4,6,8,9}) = {2,3,5,7,10}. Here rules are labeled as
   follows:
   
     DPs:
       { 1: nthtail^#(n, l) -> c_1(cond^#(ge(n, length(l)), n, l))
       , 2: cond^#(true(), n, l) -> c_2(l)
       , 3: cond^#(false(), n, l) -> c_3(tail^#(nthtail(s(n), l)))
       , 4: tail^#(nil()) -> c_9()
       , 5: tail^#(cons(x, l)) -> c_10(l)
       , 6: ge^#(u, 0()) -> c_4()
       , 7: ge^#(s(u), s(v)) -> c_5(ge^#(u, v))
       , 8: ge^#(0(), s(v)) -> c_6()
       , 9: length^#(nil()) -> c_7()
       , 10: length^#(cons(x, l)) -> c_8(length^#(l)) }
   
   We are left with following problem, upon which TcT provides the
   certificate MAYBE.
   
   Strict DPs:
     { nthtail^#(n, l) -> c_1(cond^#(ge(n, length(l)), n, l))
     , cond^#(true(), n, l) -> c_2(l)
     , cond^#(false(), n, l) -> c_3(tail^#(nthtail(s(n), l)))
     , tail^#(cons(x, l)) -> c_10(l)
     , ge^#(s(u), s(v)) -> c_5(ge^#(u, v))
     , length^#(cons(x, l)) -> c_8(length^#(l)) }
   Strict Trs:
     { nthtail(n, l) -> cond(ge(n, length(l)), n, l)
     , cond(true(), n, l) -> l
     , cond(false(), n, l) -> tail(nthtail(s(n), l))
     , ge(u, 0()) -> true()
     , ge(s(u), s(v)) -> ge(u, v)
     , ge(0(), s(v)) -> false()
     , length(nil()) -> 0()
     , length(cons(x, l)) -> s(length(l))
     , tail(nil()) -> nil()
     , tail(cons(x, l)) -> l }
   Weak DPs:
     { tail^#(nil()) -> c_9()
     , ge^#(u, 0()) -> c_4()
     , ge^#(0(), s(v)) -> c_6()
     , length^#(nil()) -> c_7() }
   Obligation:
     runtime complexity
   Answer:
     MAYBE
   
   Empty strict component of the problem is NOT empty.


Arrrr..