The Runtime Complexity (innermost) of the given CpxTRS could be proven to be BOUNDS(1, n^1).

(0) Obligation:

The Runtime Complexity (innermost) of the given CpxTRS could be proven to be BOUNDS(1, n^1).


The TRS R consists of the following rules:

f(g(x), s(0), y) → f(g(s(0)), y, g(x))
g(s(x)) → s(g(x))
g(0) → 0

Rewrite Strategy: INNERMOST

(1) DependencyGraphProof (BOTH BOUNDS(ID, ID) transformation)

The following rules are not reachable from basic terms in the dependency graph and can be removed:
f(g(x), s(0), y) → f(g(s(0)), y, g(x))

(2) Obligation:

The Runtime Complexity (innermost) of the given CpxTRS could be proven to be BOUNDS(1, n^1).


The TRS R consists of the following rules:

g(s(x)) → s(g(x))
g(0) → 0

Rewrite Strategy: INNERMOST

(3) TrsToWeightedTrsProof (BOTH BOUNDS(ID, ID) transformation)

Transformed TRS to weighted TRS

(4) Obligation:

The Runtime Complexity (innermost) of the given CpxWeightedTrs could be proven to be BOUNDS(1, n^1).


The TRS R consists of the following rules:

g(s(x)) → s(g(x)) [1]
g(0) → 0 [1]

Rewrite Strategy: INNERMOST

(5) TypeInferenceProof (BOTH BOUNDS(ID, ID) transformation)

Infered types.

(6) Obligation:

Runtime Complexity Weighted TRS with Types.
The TRS R consists of the following rules:

g(s(x)) → s(g(x)) [1]
g(0) → 0 [1]

The TRS has the following type information:

g :: s:0 → s:0 s :: s:0 → s:0 0 :: s:0

Rewrite Strategy: INNERMOST

(7) CompletionProof (UPPER BOUND(ID) transformation)

The transformation into a RNTS is sound, since:

(a) The obligation is a constructor system where every type has a constant constructor,

(b) The following defined symbols do not have to be completely defined, as they can never occur inside other defined symbols:

g

(c) The following functions are completely defined:
none

Due to the following rules being added:
none

And the following fresh constants: none

(8) Obligation:

Runtime Complexity Weighted TRS where critical functions are completely defined. The underlying TRS is:

Runtime Complexity Weighted TRS with Types. The TRS R consists of the following rules: g(s(x)) → s(g(x)) [1] g(0) → 0 [1] The TRS has the following type information: g :: s:0 → s:0 s :: s:0 → s:0 0 :: s:0 Rewrite Strategy: INNERMOST

(9) NarrowingProof (BOTH BOUNDS(ID, ID) transformation)

Narrowed the inner basic terms of all right-hand sides by a single narrowing step.

(10) Obligation:

Runtime Complexity Weighted TRS where critical functions are completely defined. The underlying TRS is:

Runtime Complexity Weighted TRS with Types. The TRS R consists of the following rules: g(s(x)) → s(g(x)) [1] g(0) → 0 [1] The TRS has the following type information: g :: s:0 → s:0 s :: s:0 → s:0 0 :: s:0 Rewrite Strategy: INNERMOST

(11) CpxTypedWeightedTrsToRntsProof (UPPER BOUND(ID) transformation)

Transformed the TRS into an over-approximating RNTS by (improved) Size Abstraction.
The constant constructors are abstracted as follows:

0 => 0

(12) Obligation:

Complexity RNTS consisting of the following rules:

g(z) -{ 1 }→ 0 :|: z = 0
g(z) -{ 1 }→ 1 + g(x) :|: x >= 0, z = 1 + x

(13) SimplificationProof (BOTH BOUNDS(ID, ID) transformation)

Simplified the RNTS by moving equalities from the constraints into the right-hand sides.

(14) Obligation:

Complexity RNTS consisting of the following rules:

g(z) -{ 1 }→ 0 :|: z = 0
g(z) -{ 1 }→ 1 + g(z - 1) :|: z - 1 >= 0

(15) CpxRntsAnalysisOrderProof (BOTH BOUNDS(ID, ID) transformation)

Found the following analysis order by SCC decomposition:

{ g }

(16) Obligation:

Complexity RNTS consisting of the following rules:

g(z) -{ 1 }→ 0 :|: z = 0
g(z) -{ 1 }→ 1 + g(z - 1) :|: z - 1 >= 0

Function symbols to be analyzed: {g}

(17) IntTrsBoundProof (UPPER BOUND(ID) transformation)

Computed SIZE bound using CoFloCo for: g
after applying outer abstraction to obtain an ITS,
resulting in: O(n¹) with polynomial bound: z

(18) Obligation:

Complexity RNTS consisting of the following rules:

g(z) -{ 1 }→ 0 :|: z = 0
g(z) -{ 1 }→ 1 + g(z - 1) :|: z - 1 >= 0

Function symbols to be analyzed: {g}
Previous analysis results are:

g: runtime: ?, size: O(n1) [z]

(19) IntTrsBoundProof (UPPER BOUND(ID) transformation)

Computed RUNTIME bound using CoFloCo for: g
after applying outer abstraction to obtain an ITS,
resulting in: O(n¹) with polynomial bound: 1 + z

(20) Obligation:

Complexity RNTS consisting of the following rules:

g(z) -{ 1 }→ 0 :|: z = 0
g(z) -{ 1 }→ 1 + g(z - 1) :|: z - 1 >= 0

Function symbols to be analyzed:
Previous analysis results are:

g: runtime: O(n1) [1 + z], size: O(n1) [z]

(21) FinalProof (EQUIVALENT transformation)

Computed overall runtime complexity

(22) BOUNDS(1, n^1)