WORST_CASE(?,O(n^1)) proof of input_LCAbP3siW9.trs # AProVE Commit ID: aff8ecad908e01718a4c36e68d2e55d5e0f16e15 fuhs 20220216 unpublished The Runtime Complexity (parallel-innermost) of the given CpxTRS could be proven to be BOUNDS(1, n^1). (0) CpxTRS (1) RelTrsToWeightedTrsProof [UPPER BOUND(ID), 0 ms] (2) CpxWeightedTrs (3) TypeInferenceProof [BOTH BOUNDS(ID, ID), 0 ms] (4) CpxTypedWeightedTrs (5) CompletionProof [UPPER BOUND(ID), 0 ms] (6) CpxTypedWeightedCompleteTrs (7) NarrowingProof [BOTH BOUNDS(ID, ID), 0 ms] (8) CpxTypedWeightedCompleteTrs (9) CpxTypedWeightedTrsToRntsProof [UPPER BOUND(ID), 0 ms] (10) CpxRNTS (11) SimplificationProof [BOTH BOUNDS(ID, ID), 0 ms] (12) CpxRNTS (13) CpxRntsAnalysisOrderProof [BOTH BOUNDS(ID, ID), 0 ms] (14) CpxRNTS (15) ResultPropagationProof [UPPER BOUND(ID), 0 ms] (16) CpxRNTS (17) IntTrsBoundProof [UPPER BOUND(ID), 260 ms] (18) CpxRNTS (19) IntTrsBoundProof [UPPER BOUND(ID), 129 ms] (20) CpxRNTS (21) FinalProof [FINISHED, 0 ms] (22) BOUNDS(1, n^1) ---------------------------------------- (0) Obligation: The Runtime Complexity (parallel-innermost) of the given CpxTRS could be proven to be BOUNDS(1, n^1). The TRS R consists of the following rules: f(0, 1, x) -> f(s(x), x, x) f(x, y, s(z)) -> s(f(0, 1, z)) S is empty. Rewrite Strategy: PARALLEL_INNERMOST ---------------------------------------- (1) RelTrsToWeightedTrsProof (UPPER BOUND(ID)) Transformed relative TRS to weighted TRS ---------------------------------------- (2) 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: f(0, 1, x) -> f(s(x), x, x) [1] f(x, y, s(z)) -> s(f(0, 1, z)) [1] Rewrite Strategy: INNERMOST ---------------------------------------- (3) TypeInferenceProof (BOTH BOUNDS(ID, ID)) Infered types. ---------------------------------------- (4) Obligation: Runtime Complexity Weighted TRS with Types. The TRS R consists of the following rules: f(0, 1, x) -> f(s(x), x, x) [1] f(x, y, s(z)) -> s(f(0, 1, z)) [1] The TRS has the following type information: f :: 0:1:s -> 0:1:s -> 0:1:s -> 0:1:s 0 :: 0:1:s 1 :: 0:1:s s :: 0:1:s -> 0:1:s Rewrite Strategy: INNERMOST ---------------------------------------- (5) CompletionProof (UPPER BOUND(ID)) 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: f_3 (c) The following functions are completely defined: none Due to the following rules being added: none And the following fresh constants: none ---------------------------------------- (6) 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: f(0, 1, x) -> f(s(x), x, x) [1] f(x, y, s(z)) -> s(f(0, 1, z)) [1] The TRS has the following type information: f :: 0:1:s -> 0:1:s -> 0:1:s -> 0:1:s 0 :: 0:1:s 1 :: 0:1:s s :: 0:1:s -> 0:1:s Rewrite Strategy: INNERMOST ---------------------------------------- (7) NarrowingProof (BOTH BOUNDS(ID, ID)) Narrowed the inner basic terms of all right-hand sides by a single narrowing step. ---------------------------------------- (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: f(0, 1, x) -> f(s(x), x, x) [1] f(x, y, s(z)) -> s(f(0, 1, z)) [1] The TRS has the following type information: f :: 0:1:s -> 0:1:s -> 0:1:s -> 0:1:s 0 :: 0:1:s 1 :: 0:1:s s :: 0:1:s -> 0:1:s Rewrite Strategy: INNERMOST ---------------------------------------- (9) CpxTypedWeightedTrsToRntsProof (UPPER BOUND(ID)) Transformed the TRS into an over-approximating RNTS by (improved) Size Abstraction. The constant constructors are abstracted as follows: 0 => 0 1 => 1 ---------------------------------------- (10) Obligation: Complexity RNTS consisting of the following rules: f(z', z'', z1) -{ 1 }-> f(1 + x, x, x) :|: x >= 0, z'' = 1, z1 = x, z' = 0 f(z', z'', z1) -{ 1 }-> 1 + f(0, 1, z) :|: z >= 0, z' = x, z'' = y, x >= 0, y >= 0, z1 = 1 + z ---------------------------------------- (11) SimplificationProof (BOTH BOUNDS(ID, ID)) Simplified the RNTS by moving equalities from the constraints into the right-hand sides. ---------------------------------------- (12) Obligation: Complexity RNTS consisting of the following rules: f(z', z'', z1) -{ 1 }-> f(1 + z1, z1, z1) :|: z1 >= 0, z'' = 1, z' = 0 f(z', z'', z1) -{ 1 }-> 1 + f(0, 1, z1 - 1) :|: z1 - 1 >= 0, z' >= 0, z'' >= 0 ---------------------------------------- (13) CpxRntsAnalysisOrderProof (BOTH BOUNDS(ID, ID)) Found the following analysis order by SCC decomposition: { f } ---------------------------------------- (14) Obligation: Complexity RNTS consisting of the following rules: f(z', z'', z1) -{ 1 }-> f(1 + z1, z1, z1) :|: z1 >= 0, z'' = 1, z' = 0 f(z', z'', z1) -{ 1 }-> 1 + f(0, 1, z1 - 1) :|: z1 - 1 >= 0, z' >= 0, z'' >= 0 Function symbols to be analyzed: {f} ---------------------------------------- (15) ResultPropagationProof (UPPER BOUND(ID)) Applied inner abstraction using the recently inferred runtime/size bounds where possible. ---------------------------------------- (16) Obligation: Complexity RNTS consisting of the following rules: f(z', z'', z1) -{ 1 }-> f(1 + z1, z1, z1) :|: z1 >= 0, z'' = 1, z' = 0 f(z', z'', z1) -{ 1 }-> 1 + f(0, 1, z1 - 1) :|: z1 - 1 >= 0, z' >= 0, z'' >= 0 Function symbols to be analyzed: {f} ---------------------------------------- (17) IntTrsBoundProof (UPPER BOUND(ID)) Computed SIZE bound using CoFloCo for: f after applying outer abstraction to obtain an ITS, resulting in: O(1) with polynomial bound: 0 ---------------------------------------- (18) Obligation: Complexity RNTS consisting of the following rules: f(z', z'', z1) -{ 1 }-> f(1 + z1, z1, z1) :|: z1 >= 0, z'' = 1, z' = 0 f(z', z'', z1) -{ 1 }-> 1 + f(0, 1, z1 - 1) :|: z1 - 1 >= 0, z' >= 0, z'' >= 0 Function symbols to be analyzed: {f} Previous analysis results are: f: runtime: ?, size: O(1) [0] ---------------------------------------- (19) IntTrsBoundProof (UPPER BOUND(ID)) Computed RUNTIME bound using KoAT for: f after applying outer abstraction to obtain an ITS, resulting in: O(n^1) with polynomial bound: 1 + 2*z1 ---------------------------------------- (20) Obligation: Complexity RNTS consisting of the following rules: f(z', z'', z1) -{ 1 }-> f(1 + z1, z1, z1) :|: z1 >= 0, z'' = 1, z' = 0 f(z', z'', z1) -{ 1 }-> 1 + f(0, 1, z1 - 1) :|: z1 - 1 >= 0, z' >= 0, z'' >= 0 Function symbols to be analyzed: Previous analysis results are: f: runtime: O(n^1) [1 + 2*z1], size: O(1) [0] ---------------------------------------- (21) FinalProof (FINISHED) Computed overall runtime complexity ---------------------------------------- (22) BOUNDS(1, n^1)