WORST_CASE(?,O(n^1)) * Step 1: DependencyPairs WORST_CASE(?,O(n^1)) + Considered Problem: - Strict TRS: f(X,Y,g(X,Y)) -> h(0(),g(X,Y)) g(X,s(Y)) -> g(X,Y) g(0(),Y) -> 0() h(X,Z) -> f(X,s(X),Z) - Signature: {f/3,g/2,h/2} / {0/0,s/1} - Obligation: innermost runtime complexity wrt. defined symbols {f,g,h} and constructors {0,s} + Applied Processor: DependencyPairs {dpKind_ = WIDP} + Details: We add the following weak innermost dependency pairs: Strict DPs f#(X,Y,g(X,Y)) -> c_1(h#(0(),g(X,Y))) g#(X,s(Y)) -> c_2(g#(X,Y)) g#(0(),Y) -> c_3() h#(X,Z) -> c_4(f#(X,s(X),Z)) Weak DPs and mark the set of starting terms. * Step 2: UsableRules WORST_CASE(?,O(n^1)) + Considered Problem: - Strict DPs: f#(X,Y,g(X,Y)) -> c_1(h#(0(),g(X,Y))) g#(X,s(Y)) -> c_2(g#(X,Y)) g#(0(),Y) -> c_3() h#(X,Z) -> c_4(f#(X,s(X),Z)) - Strict TRS: f(X,Y,g(X,Y)) -> h(0(),g(X,Y)) g(X,s(Y)) -> g(X,Y) g(0(),Y) -> 0() h(X,Z) -> f(X,s(X),Z) - Signature: {f/3,g/2,h/2,f#/3,g#/2,h#/2} / {0/0,s/1,c_1/1,c_2/1,c_3/0,c_4/1} - Obligation: innermost runtime complexity wrt. defined symbols {f#,g#,h#} and constructors {0,s} + Applied Processor: UsableRules + Details: We replace rewrite rules by usable rules: g(X,s(Y)) -> g(X,Y) g(0(),Y) -> 0() f#(X,Y,g(X,Y)) -> c_1(h#(0(),g(X,Y))) g#(X,s(Y)) -> c_2(g#(X,Y)) g#(0(),Y) -> c_3() h#(X,Z) -> c_4(f#(X,s(X),Z)) * Step 3: WeightGap WORST_CASE(?,O(n^1)) + Considered Problem: - Strict DPs: f#(X,Y,g(X,Y)) -> c_1(h#(0(),g(X,Y))) g#(X,s(Y)) -> c_2(g#(X,Y)) g#(0(),Y) -> c_3() h#(X,Z) -> c_4(f#(X,s(X),Z)) - Strict TRS: g(X,s(Y)) -> g(X,Y) g(0(),Y) -> 0() - Signature: {f/3,g/2,h/2,f#/3,g#/2,h#/2} / {0/0,s/1,c_1/1,c_2/1,c_3/0,c_4/1} - Obligation: innermost runtime complexity wrt. defined symbols {f#,g#,h#} and constructors {0,s} + Applied Processor: WeightGap {wgDimension = 1, wgDegree = 1, wgKind = Algebraic, wgUArgs = UArgs, wgOn = WgOnTrs} + Details: The weightgap principle applies using the following constant growth matrix-interpretation: We apply a matrix interpretation of kind constructor based matrix interpretation: The following argument positions are considered usable: uargs(c_1) = {1}, uargs(c_2) = {1}, uargs(c_4) = {1} Following symbols are considered usable: all TcT has computed the following interpretation: p(0) = [0] p(f) = [0] p(g) = [4] x2 + [2] p(h) = [1] x1 + [2] p(s) = [1] x1 + [4] p(f#) = [10] x1 + [2] x2 + [4] x3 + [0] p(g#) = [8] x1 + [1] x2 + [1] p(h#) = [13] x1 + [4] x2 + [2] p(c_1) = [1] x1 + [4] p(c_2) = [1] x1 + [3] p(c_3) = [2] p(c_4) = [1] x1 + [8] Following rules are strictly oriented: g#(X,s(Y)) = [8] X + [1] Y + [5] > [8] X + [1] Y + [4] = c_2(g#(X,Y)) g(X,s(Y)) = [4] Y + [18] > [4] Y + [2] = g(X,Y) g(0(),Y) = [4] Y + [2] > [0] = 0() Following rules are (at-least) weakly oriented: f#(X,Y,g(X,Y)) = [10] X + [18] Y + [8] >= [16] Y + [14] = c_1(h#(0(),g(X,Y))) g#(0(),Y) = [1] Y + [1] >= [2] = c_3() h#(X,Z) = [13] X + [4] Z + [2] >= [12] X + [4] Z + [16] = c_4(f#(X,s(X),Z)) Further, it can be verified that all rules not oriented are covered by the weightgap condition. * Step 4: RemoveInapplicable WORST_CASE(?,O(1)) + Considered Problem: - Strict DPs: f#(X,Y,g(X,Y)) -> c_1(h#(0(),g(X,Y))) g#(0(),Y) -> c_3() h#(X,Z) -> c_4(f#(X,s(X),Z)) - Weak DPs: g#(X,s(Y)) -> c_2(g#(X,Y)) - Weak TRS: g(X,s(Y)) -> g(X,Y) g(0(),Y) -> 0() - Signature: {f/3,g/2,h/2,f#/3,g#/2,h#/2} / {0/0,s/1,c_1/1,c_2/1,c_3/0,c_4/1} - Obligation: innermost runtime complexity wrt. defined symbols {f#,g#,h#} and constructors {0,s} + Applied Processor: RemoveInapplicable + Details: Only the nodes {2,3,4} are reachable from nodes {2,3,4} that start derivation from marked basic terms. The nodes not reachable are removed from the problem. * Step 5: PredecessorEstimation WORST_CASE(?,O(1)) + Considered Problem: - Strict DPs: g#(0(),Y) -> c_3() h#(X,Z) -> c_4(f#(X,s(X),Z)) - Weak DPs: g#(X,s(Y)) -> c_2(g#(X,Y)) - Weak TRS: g(X,s(Y)) -> g(X,Y) g(0(),Y) -> 0() - Signature: {f/3,g/2,h/2,f#/3,g#/2,h#/2} / {0/0,s/1,c_1/1,c_2/1,c_3/0,c_4/1} - Obligation: innermost runtime complexity wrt. defined symbols {f#,g#,h#} and constructors {0,s} + Applied Processor: PredecessorEstimation {onSelection = all simple predecessor estimation selector} + Details: We estimate the number of application of {2} by application of Pre({2}) = {}. Here rules are labelled as follows: 1: g#(0(),Y) -> c_3() 2: h#(X,Z) -> c_4(f#(X,s(X),Z)) 3: g#(X,s(Y)) -> c_2(g#(X,Y)) * Step 6: RemoveWeakSuffixes WORST_CASE(?,O(1)) + Considered Problem: - Strict DPs: g#(0(),Y) -> c_3() - Weak DPs: g#(X,s(Y)) -> c_2(g#(X,Y)) h#(X,Z) -> c_4(f#(X,s(X),Z)) - Weak TRS: g(X,s(Y)) -> g(X,Y) g(0(),Y) -> 0() - Signature: {f/3,g/2,h/2,f#/3,g#/2,h#/2} / {0/0,s/1,c_1/1,c_2/1,c_3/0,c_4/1} - Obligation: innermost runtime complexity wrt. defined symbols {f#,g#,h#} and constructors {0,s} + Applied Processor: RemoveWeakSuffixes + Details: Consider the dependency graph 1:S:g#(0(),Y) -> c_3() 2:W:g#(X,s(Y)) -> c_2(g#(X,Y)) -->_1 g#(X,s(Y)) -> c_2(g#(X,Y)):2 -->_1 g#(0(),Y) -> c_3():1 3:W:h#(X,Z) -> c_4(f#(X,s(X),Z)) The following weak DPs constitute a sub-graph of the DG that is closed under successors. The DPs are removed. 3: h#(X,Z) -> c_4(f#(X,s(X),Z)) * Step 7: UsableRules WORST_CASE(?,O(1)) + Considered Problem: - Strict DPs: g#(0(),Y) -> c_3() - Weak DPs: g#(X,s(Y)) -> c_2(g#(X,Y)) - Weak TRS: g(X,s(Y)) -> g(X,Y) g(0(),Y) -> 0() - Signature: {f/3,g/2,h/2,f#/3,g#/2,h#/2} / {0/0,s/1,c_1/1,c_2/1,c_3/0,c_4/1} - Obligation: innermost runtime complexity wrt. defined symbols {f#,g#,h#} and constructors {0,s} + Applied Processor: UsableRules + Details: We replace rewrite rules by usable rules: g#(X,s(Y)) -> c_2(g#(X,Y)) g#(0(),Y) -> c_3() * Step 8: PredecessorEstimationCP WORST_CASE(?,O(1)) + Considered Problem: - Strict DPs: g#(0(),Y) -> c_3() - Weak DPs: g#(X,s(Y)) -> c_2(g#(X,Y)) - Signature: {f/3,g/2,h/2,f#/3,g#/2,h#/2} / {0/0,s/1,c_1/1,c_2/1,c_3/0,c_4/1} - Obligation: innermost runtime complexity wrt. defined symbols {f#,g#,h#} and constructors {0,s} + Applied Processor: PredecessorEstimationCP {onSelectionCP = any intersect of rules of CDG leaf and strict-rules, withComplexityPair = NaturalMI {miDimension = 1, miDegree = 0, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Nothing}} + Details: We first use the processor NaturalMI {miDimension = 1, miDegree = 0, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Nothing} to orient following rules strictly: 1: g#(0(),Y) -> c_3() The strictly oriented rules are moved into the weak component. ** Step 8.a:1: NaturalMI WORST_CASE(?,O(1)) + Considered Problem: - Strict DPs: g#(0(),Y) -> c_3() - Weak DPs: g#(X,s(Y)) -> c_2(g#(X,Y)) - Signature: {f/3,g/2,h/2,f#/3,g#/2,h#/2} / {0/0,s/1,c_1/1,c_2/1,c_3/0,c_4/1} - Obligation: innermost runtime complexity wrt. defined symbols {f#,g#,h#} and constructors {0,s} + Applied Processor: NaturalMI {miDimension = 1, miDegree = 0, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Just first alternative for predecessorEstimation on any intersect of rules of CDG leaf and strict-rules} + Details: We apply a matrix interpretation of kind constructor based matrix interpretation (containing no more than 0 non-zero interpretation-entries in the diagonal of the component-wise maxima): The following argument positions are considered usable: uargs(c_2) = {1} Following symbols are considered usable: {f#,g#,h#} TcT has computed the following interpretation: p(0) = [0] p(f) = [0] p(g) = [0] p(h) = [0] p(s) = [0] p(f#) = [0] p(g#) = [5] p(h#) = [0] p(c_1) = [0] p(c_2) = [1] x1 + [0] p(c_3) = [1] p(c_4) = [0] Following rules are strictly oriented: g#(0(),Y) = [5] > [1] = c_3() Following rules are (at-least) weakly oriented: g#(X,s(Y)) = [5] >= [5] = c_2(g#(X,Y)) ** Step 8.a:2: Assumption WORST_CASE(?,O(1)) + Considered Problem: - Weak DPs: g#(X,s(Y)) -> c_2(g#(X,Y)) g#(0(),Y) -> c_3() - Signature: {f/3,g/2,h/2,f#/3,g#/2,h#/2} / {0/0,s/1,c_1/1,c_2/1,c_3/0,c_4/1} - Obligation: innermost runtime complexity wrt. defined symbols {f#,g#,h#} and constructors {0,s} + Applied Processor: Assumption {assumed = Certificate {spaceUB = Unknown, spaceLB = Unknown, timeUB = Poly (Just 0), timeLB = Unknown}} + Details: () ** Step 8.b:1: RemoveWeakSuffixes WORST_CASE(?,O(1)) + Considered Problem: - Weak DPs: g#(X,s(Y)) -> c_2(g#(X,Y)) g#(0(),Y) -> c_3() - Signature: {f/3,g/2,h/2,f#/3,g#/2,h#/2} / {0/0,s/1,c_1/1,c_2/1,c_3/0,c_4/1} - Obligation: innermost runtime complexity wrt. defined symbols {f#,g#,h#} and constructors {0,s} + Applied Processor: RemoveWeakSuffixes + Details: Consider the dependency graph 1:W:g#(X,s(Y)) -> c_2(g#(X,Y)) -->_1 g#(0(),Y) -> c_3():2 -->_1 g#(X,s(Y)) -> c_2(g#(X,Y)):1 2:W:g#(0(),Y) -> c_3() The following weak DPs constitute a sub-graph of the DG that is closed under successors. The DPs are removed. 1: g#(X,s(Y)) -> c_2(g#(X,Y)) 2: g#(0(),Y) -> c_3() ** Step 8.b:2: EmptyProcessor WORST_CASE(?,O(1)) + Considered Problem: - Signature: {f/3,g/2,h/2,f#/3,g#/2,h#/2} / {0/0,s/1,c_1/1,c_2/1,c_3/0,c_4/1} - Obligation: innermost runtime complexity wrt. defined symbols {f#,g#,h#} and constructors {0,s} + Applied Processor: EmptyProcessor + Details: The problem is already closed. The intended complexity is O(1). WORST_CASE(?,O(n^1))