WORST_CASE(Omega(n^1),?)
* Step 1: Sum.  WORST_CASE(Omega(n^1),?)
    + Considered Problem:
        - Strict TRS:
            add(0(),X) -> X
            add(s(X),Y) -> s(add(X,Y))
            from(X) -> cons(X,from(s(X)))
            fst(0(),Z) -> nil()
            fst(s(X),cons(Y,Z)) -> cons(Y,fst(X,Z))
            len(cons(X,Z)) -> s(len(Z))
            len(nil()) -> 0()
        - Signature:
            {add/2,from/1,fst/2,len/1} / {0/0,cons/2,nil/0,s/1}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {add,from,fst,len} and constructors {0,cons,nil,s}
    + Applied Processor:
        Sum {left = someStrategy, right = someStrategy}
    + Details:
        ()
* Step 2: Sum.  WORST_CASE(Omega(n^1),?)
    + Considered Problem:
        - Strict TRS:
            add(0(),X) -> X
            add(s(X),Y) -> s(add(X,Y))
            from(X) -> cons(X,from(s(X)))
            fst(0(),Z) -> nil()
            fst(s(X),cons(Y,Z)) -> cons(Y,fst(X,Z))
            len(cons(X,Z)) -> s(len(Z))
            len(nil()) -> 0()
        - Signature:
            {add/2,from/1,fst/2,len/1} / {0/0,cons/2,nil/0,s/1}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {add,from,fst,len} and constructors {0,cons,nil,s}
    + Applied Processor:
        Sum {left = someStrategy, right = someStrategy}
    + Details:
        ()
** Step 2.a:1: Ara.  MAYBE
    + Considered Problem:
        - Strict TRS:
            add(0(),X) -> X
            add(s(X),Y) -> s(add(X,Y))
            from(X) -> cons(X,from(s(X)))
            fst(0(),Z) -> nil()
            fst(s(X),cons(Y,Z)) -> cons(Y,fst(X,Z))
            len(cons(X,Z)) -> s(len(Z))
            len(nil()) -> 0()
        - Signature:
            {add/2,from/1,fst/2,len/1} / {0/0,cons/2,nil/0,s/1}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {add,from,fst,len} and constructors {0,cons,nil,s}
    + Applied Processor:
        Ara {minDegree = 1, maxDegree = 3, araTimeout = 15, araRuleShifting = Just 1, isBestCase = True, mkCompletelyDefined = False, verboseOutput = False}
    + Details:
        Signatures used:
        ----------------
          F (TrsFun "0") :: [] -(0)-> "A"(0)
          F (TrsFun "add") :: ["A"(0) x "A"(0)] -(1)-> "A"(0)
          F (TrsFun "cons") :: ["A"(0) x "A"(0)] -(0)-> "A"(0)
          F (TrsFun "cons") :: ["A"(0) x "A"(1)] -(1)-> "A"(1)
          F (TrsFun "from") :: ["A"(0)] -(1)-> "A"(0)
          F (TrsFun "fst") :: ["A"(0) x "A"(0)] -(1)-> "A"(0)
          F (TrsFun "len") :: ["A"(1)] -(1)-> "A"(0)
          F (TrsFun "main") :: ["A"(1)] -(1)-> "A"(0)
          F (TrsFun "nil") :: [] -(0)-> "A"(1)
          F (TrsFun "nil") :: [] -(0)-> "A"(0)
          F (TrsFun "s") :: ["A"(0)] -(0)-> "A"(0)
        
        
        Cost-free Signatures used:
        --------------------------
        
        
        
        Base Constructor Signatures used:
        ---------------------------------
        
        
        
        Following Still Strict Rules were Typed as:
        -------------------------------------------
        1. Strict:
          add(0(),X) -> X
          add(s(X),Y) -> s(add(X,Y))
          from(X) -> cons(X,from(s(X)))
          fst(0(),Z) -> nil()
          fst(s(X),cons(Y,Z)) -> cons(Y,fst(X,Z))
          len(cons(X,Z)) -> s(len(Z))
          len(nil()) -> 0()
          main(x1) -> len(x1)
        2. Weak:
          
        

** Step 2.b:1: DecreasingLoops.  WORST_CASE(Omega(n^1),?)
    + Considered Problem:
        - Strict TRS:
            add(0(),X) -> X
            add(s(X),Y) -> s(add(X,Y))
            from(X) -> cons(X,from(s(X)))
            fst(0(),Z) -> nil()
            fst(s(X),cons(Y,Z)) -> cons(Y,fst(X,Z))
            len(cons(X,Z)) -> s(len(Z))
            len(nil()) -> 0()
        - Signature:
            {add/2,from/1,fst/2,len/1} / {0/0,cons/2,nil/0,s/1}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {add,from,fst,len} and constructors {0,cons,nil,s}
    + Applied Processor:
        DecreasingLoops {bound = AnyLoop, narrow = 10}
    + Details:
        The system has following decreasing Loops:
          add(x,y){x -> s(x)} =
            add(s(x),y) ->^+ s(add(x,y))
              = C[add(x,y) = add(x,y){}]

WORST_CASE(Omega(n^1),?)