* Step 1: DependencyPairs WORST_CASE(?,O(n^1))
+ Considered Problem:
- Strict TRS:
quot(x,0(),s(z)) -> s(quot(x,s(z),s(z)))
quot(0(),s(y),s(z)) -> 0()
quot(s(x),s(y),z) -> quot(x,y,z)
- Signature:
{quot/3} / {0/0,s/1}
- Obligation:
runtime complexity wrt. defined symbols {quot} and constructors {0,s}
+ Applied Processor:
DependencyPairs {dpKind_ = WIDP}
+ Details:
We add the following weak dependency pairs:
Strict DPs
quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
quot#(0(),s(y),s(z)) -> c_2()
quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
Weak DPs
and mark the set of starting terms.
* Step 2: UsableRules WORST_CASE(?,O(n^1))
+ Considered Problem:
- Strict DPs:
quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
quot#(0(),s(y),s(z)) -> c_2()
quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
- Strict TRS:
quot(x,0(),s(z)) -> s(quot(x,s(z),s(z)))
quot(0(),s(y),s(z)) -> 0()
quot(s(x),s(y),z) -> quot(x,y,z)
- Signature:
{quot/3,quot#/3} / {0/0,s/1,c_1/1,c_2/0,c_3/1}
- Obligation:
runtime complexity wrt. defined symbols {quot#} and constructors {0,s}
+ Applied Processor:
UsableRules
+ Details:
We replace rewrite rules by usable rules:
quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
quot#(0(),s(y),s(z)) -> c_2()
quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
* Step 3: PredecessorEstimation WORST_CASE(?,O(n^1))
+ Considered Problem:
- Strict DPs:
quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
quot#(0(),s(y),s(z)) -> c_2()
quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
- Signature:
{quot/3,quot#/3} / {0/0,s/1,c_1/1,c_2/0,c_3/1}
- Obligation:
runtime complexity wrt. defined symbols {quot#} 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}) = {1,3}.
Here rules are labelled as follows:
1: quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
2: quot#(0(),s(y),s(z)) -> c_2()
3: quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
* Step 4: RemoveWeakSuffixes WORST_CASE(?,O(n^1))
+ Considered Problem:
- Strict DPs:
quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
- Weak DPs:
quot#(0(),s(y),s(z)) -> c_2()
- Signature:
{quot/3,quot#/3} / {0/0,s/1,c_1/1,c_2/0,c_3/1}
- Obligation:
runtime complexity wrt. defined symbols {quot#} and constructors {0,s}
+ Applied Processor:
RemoveWeakSuffixes
+ Details:
Consider the dependency graph
1:S:quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
-->_1 quot#(s(x),s(y),z) -> c_3(quot#(x,y,z)):2
-->_1 quot#(0(),s(y),s(z)) -> c_2():3
2:S:quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
-->_1 quot#(0(),s(y),s(z)) -> c_2():3
-->_1 quot#(s(x),s(y),z) -> c_3(quot#(x,y,z)):2
-->_1 quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z))):1
3:W:quot#(0(),s(y),s(z)) -> c_2()
The following weak DPs constitute a sub-graph of the DG that is closed under successors. The DPs are removed.
3: quot#(0(),s(y),s(z)) -> c_2()
* Step 5: PredecessorEstimationCP WORST_CASE(?,O(n^1))
+ Considered Problem:
- Strict DPs:
quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
- Signature:
{quot/3,quot#/3} / {0/0,s/1,c_1/1,c_2/0,c_3/1}
- Obligation:
runtime complexity wrt. defined symbols {quot#} and constructors {0,s}
+ Applied Processor:
PredecessorEstimationCP {onSelectionCP = any intersect of rules of CDG leaf and strict-rules, withComplexityPair = NaturalMI {miDimension = 1, miDegree = 1, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Nothing}}
+ Details:
We first use the processor NaturalMI {miDimension = 1, miDegree = 1, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Nothing} to orient following rules strictly:
2: quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
Consider the set of all dependency pairs
1: quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
2: quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
Processor NaturalMI {miDimension = 1, miDegree = 1, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Nothing}induces the complexity certificateTIME (?,O(n^1))
SPACE(?,?)on application of the dependency pairs
{2}
These cover all (indirect) predecessors of dependency pairs
{1,2}
their number of applications is equally bounded.
The dependency pairs are shifted into the weak component.
** Step 5.a:1: NaturalMI WORST_CASE(?,O(n^1))
+ Considered Problem:
- Strict DPs:
quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
- Signature:
{quot/3,quot#/3} / {0/0,s/1,c_1/1,c_2/0,c_3/1}
- Obligation:
runtime complexity wrt. defined symbols {quot#} and constructors {0,s}
+ Applied Processor:
NaturalMI {miDimension = 1, miDegree = 1, 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:
The following argument positions are considered usable:
uargs(c_1) = {1},
uargs(c_3) = {1}
Following symbols are considered usable:
all
TcT has computed the following interpretation:
p(0) = [2]
p(quot) = [1] x1 + [1]
p(s) = [1] x1 + [4]
p(quot#) = [1] x1 + [2]
p(c_1) = [1] x1 + [0]
p(c_2) = [1]
p(c_3) = [1] x1 + [2]
Following rules are strictly oriented:
quot#(s(x),s(y),z) = [1] x + [6]
> [1] x + [4]
= c_3(quot#(x,y,z))
Following rules are (at-least) weakly oriented:
quot#(x,0(),s(z)) = [1] x + [2]
>= [1] x + [2]
= c_1(quot#(x,s(z),s(z)))
** Step 5.a:2: Assumption WORST_CASE(?,O(1))
+ Considered Problem:
- Strict DPs:
quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
- Weak DPs:
quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
- Signature:
{quot/3,quot#/3} / {0/0,s/1,c_1/1,c_2/0,c_3/1}
- Obligation:
runtime complexity wrt. defined symbols {quot#} and constructors {0,s}
+ Applied Processor:
Assumption {assumed = Certificate {spaceUB = Unknown, spaceLB = Unknown, timeUB = Poly (Just 0), timeLB = Unknown}}
+ Details:
()
** Step 5.b:1: RemoveWeakSuffixes WORST_CASE(?,O(1))
+ Considered Problem:
- Weak DPs:
quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
- Signature:
{quot/3,quot#/3} / {0/0,s/1,c_1/1,c_2/0,c_3/1}
- Obligation:
runtime complexity wrt. defined symbols {quot#} and constructors {0,s}
+ Applied Processor:
RemoveWeakSuffixes
+ Details:
Consider the dependency graph
1:W:quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
-->_1 quot#(s(x),s(y),z) -> c_3(quot#(x,y,z)):2
2:W:quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
-->_1 quot#(s(x),s(y),z) -> c_3(quot#(x,y,z)):2
-->_1 quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z))):1
The following weak DPs constitute a sub-graph of the DG that is closed under successors. The DPs are removed.
1: quot#(x,0(),s(z)) -> c_1(quot#(x,s(z),s(z)))
2: quot#(s(x),s(y),z) -> c_3(quot#(x,y,z))
** Step 5.b:2: EmptyProcessor WORST_CASE(?,O(1))
+ Considered Problem:
- Signature:
{quot/3,quot#/3} / {0/0,s/1,c_1/1,c_2/0,c_3/1}
- Obligation:
runtime complexity wrt. defined symbols {quot#} and constructors {0,s}
+ Applied Processor:
EmptyProcessor
+ Details:
The problem is already closed. The intended complexity is O(1).
WORST_CASE(?,O(n^1))