/export/starexec/sandbox/solver/bin/starexec_run_complexity /export/starexec/sandbox/benchmark/theBenchmark.koat /export/starexec/sandbox/output/output_files


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WORST_CASE(Omega(n^1), O(n^1))
proof of /export/starexec/sandbox/benchmark/theBenchmark.koat
# AProVE Commit ID: 794c25de1cacf0d048858bcd21c9a779e1221865 marcel 20200619 unpublished dirty


The runtime complexity of the given CpxIntTrs could be proven to be BOUNDS(n^1, n^1).

(0) CpxIntTrs
(1) Koat Proof [FINISHED, 18 ms]
(2) BOUNDS(1, n^1)
(3) Loat Proof [FINISHED, 227 ms]
(4) BOUNDS(n^1, INF)


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(0)
Obligation:
Complexity Int TRS consisting of the following rules:
eval1(A, B, C) -> Com_1(eval2(A, B, C)) :|: A >= B + 1 && C >= A && C <= A
eval2(A, B, C) -> Com_1(eval2(A - 1, B, C - 1)) :|: A >= B + 1
eval2(A, B, C) -> Com_1(eval1(A, B, C)) :|: B >= A
start(A, B, C) -> Com_1(eval1(A, B, C)) :|: TRUE

The start-symbols are:[start_3]


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(1) Koat Proof (FINISHED)
YES(?, Ar_0 + Ar_1 + 3)



Initial complexity problem:

1:	T:

		(Comp: ?, Cost: 1)    eval1(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0, Ar_1, Ar_2)) [ Ar_0 >= Ar_1 + 1 /\ Ar_2 = Ar_0 ]

		(Comp: ?, Cost: 1)    eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0 - 1, Ar_1, Ar_2 - 1)) [ Ar_0 >= Ar_1 + 1 ]

		(Comp: ?, Cost: 1)    eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2)) [ Ar_1 >= Ar_0 ]

		(Comp: ?, Cost: 1)    start(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2))

		(Comp: 1, Cost: 0)    koat_start(Ar_0, Ar_1, Ar_2) -> Com_1(start(Ar_0, Ar_1, Ar_2)) [ 0 <= 0 ]

	start location:	koat_start

	leaf cost:	0



Repeatedly propagating knowledge in problem 1 produces the following problem:

2:	T:

		(Comp: 1, Cost: 1)    eval1(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0, Ar_1, Ar_2)) [ Ar_0 >= Ar_1 + 1 /\ Ar_2 = Ar_0 ]

		(Comp: ?, Cost: 1)    eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0 - 1, Ar_1, Ar_2 - 1)) [ Ar_0 >= Ar_1 + 1 ]

		(Comp: ?, Cost: 1)    eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2)) [ Ar_1 >= Ar_0 ]

		(Comp: 1, Cost: 1)    start(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2))

		(Comp: 1, Cost: 0)    koat_start(Ar_0, Ar_1, Ar_2) -> Com_1(start(Ar_0, Ar_1, Ar_2)) [ 0 <= 0 ]

	start location:	koat_start

	leaf cost:	0



A polynomial rank function with

	Pol(eval2) = 1

	Pol(eval1) = 0

and size complexities

	S("koat_start(Ar_0, Ar_1, Ar_2) -> Com_1(start(Ar_0, Ar_1, Ar_2)) [ 0 <= 0 ]", 0-0) = Ar_0

	S("koat_start(Ar_0, Ar_1, Ar_2) -> Com_1(start(Ar_0, Ar_1, Ar_2)) [ 0 <= 0 ]", 0-1) = Ar_1

	S("koat_start(Ar_0, Ar_1, Ar_2) -> Com_1(start(Ar_0, Ar_1, Ar_2)) [ 0 <= 0 ]", 0-2) = Ar_2

	S("start(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2))", 0-0) = Ar_0

	S("start(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2))", 0-1) = Ar_1

	S("start(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2))", 0-2) = Ar_2

	S("eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2)) [ Ar_1 >= Ar_0 ]", 0-0) = ?

	S("eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2)) [ Ar_1 >= Ar_0 ]", 0-1) = Ar_1

	S("eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2)) [ Ar_1 >= Ar_0 ]", 0-2) = ?

	S("eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0 - 1, Ar_1, Ar_2 - 1)) [ Ar_0 >= Ar_1 + 1 ]", 0-0) = ?

	S("eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0 - 1, Ar_1, Ar_2 - 1)) [ Ar_0 >= Ar_1 + 1 ]", 0-1) = Ar_1

	S("eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0 - 1, Ar_1, Ar_2 - 1)) [ Ar_0 >= Ar_1 + 1 ]", 0-2) = ?

	S("eval1(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0, Ar_1, Ar_2)) [ Ar_0 >= Ar_1 + 1 /\\ Ar_2 = Ar_0 ]", 0-0) = Ar_0

	S("eval1(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0, Ar_1, Ar_2)) [ Ar_0 >= Ar_1 + 1 /\\ Ar_2 = Ar_0 ]", 0-1) = Ar_1

	S("eval1(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0, Ar_1, Ar_2)) [ Ar_0 >= Ar_1 + 1 /\\ Ar_2 = Ar_0 ]", 0-2) = Ar_2

orients the transitions

	eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0 - 1, Ar_1, Ar_2 - 1)) [ Ar_0 >= Ar_1 + 1 ]

	eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2)) [ Ar_1 >= Ar_0 ]

weakly and the transition

	eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2)) [ Ar_1 >= Ar_0 ]

strictly and produces the following problem:

3:	T:

		(Comp: 1, Cost: 1)    eval1(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0, Ar_1, Ar_2)) [ Ar_0 >= Ar_1 + 1 /\ Ar_2 = Ar_0 ]

		(Comp: ?, Cost: 1)    eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0 - 1, Ar_1, Ar_2 - 1)) [ Ar_0 >= Ar_1 + 1 ]

		(Comp: 1, Cost: 1)    eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2)) [ Ar_1 >= Ar_0 ]

		(Comp: 1, Cost: 1)    start(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2))

		(Comp: 1, Cost: 0)    koat_start(Ar_0, Ar_1, Ar_2) -> Com_1(start(Ar_0, Ar_1, Ar_2)) [ 0 <= 0 ]

	start location:	koat_start

	leaf cost:	0



A polynomial rank function with

	Pol(eval1) = V_1 - V_2

	Pol(eval2) = V_1 - V_2

	Pol(start) = V_1 - V_2

	Pol(koat_start) = V_1 - V_2

orients all transitions weakly and the transition

	eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0 - 1, Ar_1, Ar_2 - 1)) [ Ar_0 >= Ar_1 + 1 ]

strictly and produces the following problem:

4:	T:

		(Comp: 1, Cost: 1)              eval1(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0, Ar_1, Ar_2)) [ Ar_0 >= Ar_1 + 1 /\ Ar_2 = Ar_0 ]

		(Comp: Ar_0 + Ar_1, Cost: 1)    eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval2(Ar_0 - 1, Ar_1, Ar_2 - 1)) [ Ar_0 >= Ar_1 + 1 ]

		(Comp: 1, Cost: 1)              eval2(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2)) [ Ar_1 >= Ar_0 ]

		(Comp: 1, Cost: 1)              start(Ar_0, Ar_1, Ar_2) -> Com_1(eval1(Ar_0, Ar_1, Ar_2))

		(Comp: 1, Cost: 0)              koat_start(Ar_0, Ar_1, Ar_2) -> Com_1(start(Ar_0, Ar_1, Ar_2)) [ 0 <= 0 ]

	start location:	koat_start

	leaf cost:	0



Complexity upper bound Ar_0 + Ar_1 + 3



Time: 0.039 sec (SMT: 0.032 sec)


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(2)
BOUNDS(1, n^1)

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(3) Loat Proof (FINISHED)


### Pre-processing the ITS problem ###



Initial linear ITS problem

   Start location: start

      0: eval1 -> eval2 : [ A>=1+B && C==A ], cost: 1

      1: eval2 -> eval2 : A'=-1+A, C'=-1+C, [ A>=1+B ], cost: 1

      2: eval2 -> eval1 : [ B>=A ], cost: 1

      3: start -> eval1 : [], cost: 1



Checking for constant complexity:

   The following rule is satisfiable with cost >= 1, yielding constant complexity:

      3: start -> eval1 : [], cost: 1



### Simplification by acceleration and chaining ###



Accelerating simple loops of location 1.

   Accelerating the following rules:

      1: eval2 -> eval2 : A'=-1+A, C'=-1+C, [ A>=1+B ], cost: 1



   Accelerated rule 1 with metering function A-B, yielding the new rule 4.

   Removing the simple loops: 1.



Accelerated all simple loops using metering functions (where possible):

   Start location: start

      0: eval1 -> eval2 : [ A>=1+B && C==A ], cost: 1

      2: eval2 -> eval1 : [ B>=A ], cost: 1

      4: eval2 -> eval2 : A'=B, C'=C-A+B, [ A>=1+B ], cost: A-B

      3: start -> eval1 : [], cost: 1



Chained accelerated rules (with incoming rules):

   Start location: start

      0: eval1 -> eval2 : [ A>=1+B && C==A ], cost: 1

      5: eval1 -> eval2 : A'=B, C'=C-A+B, [ A>=1+B && C==A ], cost: 1+A-B

      2: eval2 -> eval1 : [ B>=A ], cost: 1

      3: start -> eval1 : [], cost: 1



Eliminated locations (on tree-shaped paths):

   Start location: start

      6: eval1 -> eval1 : A'=B, C'=C-A+B, [ A>=1+B && C==A ], cost: 2+A-B

      3: start -> eval1 : [], cost: 1



Accelerating simple loops of location 0.

   Accelerating the following rules:

      6: eval1 -> eval1 : A'=B, C'=C-A+B, [ A>=1+B && C==A ], cost: 2+A-B



   Found no metering function for rule 6.

   Removing the simple loops:.



Accelerated all simple loops using metering functions (where possible):

   Start location: start

      6: eval1 -> eval1 : A'=B, C'=C-A+B, [ A>=1+B && C==A ], cost: 2+A-B

      3: start -> eval1 : [], cost: 1



Chained accelerated rules (with incoming rules):

   Start location: start

      3: start -> eval1 : [], cost: 1

      7: start -> eval1 : A'=B, C'=C-A+B, [ A>=1+B && C==A ], cost: 3+A-B



Removed unreachable locations (and leaf rules with constant cost):

   Start location: start

      7: start -> eval1 : A'=B, C'=C-A+B, [ A>=1+B && C==A ], cost: 3+A-B



### Computing asymptotic complexity ###



Fully simplified ITS problem

   Start location: start

      7: start -> eval1 : A'=B, C'=C-A+B, [ A>=1+B && C==A ], cost: 3+A-B



Computing asymptotic complexity for rule 7

   Solved the limit problem by the following transformations:

      Created initial limit problem:

      1-C+A (+/+!), 1+C-A (+/+!), A-B (+/+!), 3+A-B (+) [not solved]



      removing all constraints (solved by SMT)

      resulting limit problem: [solved]



      applying transformation rule (C) using substitution {C==0,A==0,B==-n}

      resulting limit problem:

      [solved]



   Solution:

      C / 0

      A / 0

      B / -n

   Resulting cost 3+n has complexity: Poly(n^1)



Found new complexity Poly(n^1).



Obtained the following overall complexity (w.r.t. the length of the input n):

   Complexity:  Poly(n^1)

   Cpx degree:  1

   Solved cost: 3+n

   Rule cost:   3+A-B

   Rule guard:  [ A>=1+B && C==A ]



WORST_CASE(Omega(n^1),?)


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(4)
BOUNDS(n^1, INF)