From Undecidability.L.Tactics Require Import LTactics.
From Undecidability.L Require Import UpToC.
From Undecidability.L Require Import Functions.EqBool.
From Undecidability.L.Datatypes Require Export List.List_enc LBool LOptions LNat.
Set Default Proof Using "Type".
Section Fix_X.
Variable (X:Type).
Context {intX : registered X}.
Fixpoint inb eqb (x:X) (A: list X) :=
match A with
nil => false
| a::A' => orb (eqb a x) (inb eqb x A')
end.
Variable X_eqb : X -> X -> bool.
Hypothesis X_eqb_spec : (forall (x y:X), Bool.reflect (x=y) (X_eqb x y)).
Lemma inb_spec: forall x A, Bool.reflect (In x A) (inb X_eqb x A).
Proof using X_eqb_spec.
intros x A. induction A.
-constructor. tauto.
-simpl. destruct (X_eqb_spec a x).
+constructor. tauto.
+inv IHA. destruct (X_eqb_spec a x).
*constructor. tauto.
*constructor. tauto.
*constructor. tauto.
Qed.
Global Instance term_inb: computableTime' inb (fun eq eqT => (5,fun x _ => (1,fun l _ =>
(fold_right (fun x' res => callTime2 eqT x' x
+ res + 17) 4 l ,tt)))).
Proof.
extract.
solverec.
Defined. (*because other extract*)
Global Instance term_inb_notime: computable inb.
Proof.
extract.
Defined. (*because other extract*)
End Fix_X.
Section list_eqb.
Variable X : Type.
Variable eqb : X -> X -> bool.
Variable spec : forall x y, reflect (x = y) (eqb x y).
Fixpoint list_eqb A B :=
match A,B with
| nil,nil => true
| a::A',b::B' => eqb a b && list_eqb A' B'
| _,_ => false
end.
Lemma list_eqb_spec A B : reflect (A = B) (list_eqb A B).
Proof using spec.
revert B; induction A; intros; destruct B; cbn in *; try now econstructor.
destruct (spec a x), (IHA B); cbn; econstructor; congruence.
Qed.
End list_eqb.
Section int.
Context {X : Type}.
Context {HX : registered X}.
Fixpoint list_eqbTime (eqbT: timeComplexity (X -> X -> bool)) (A B:list X) :=
match A,B with
a::A,b::B => callTime2 eqbT a b + 22 + list_eqbTime eqbT A B
| _,_ => 9
end.
Global Instance term_list_eqb : computableTime' (list_eqb (X:=X))
(fun _ eqbT => (1,(fun A _ => (5,fun B _ => (list_eqbTime eqbT A B,tt))))).
Proof.
extract.
solverec.
Qed.
Definition list_eqbTime_leq (eqbT: timeComplexity (X -> X -> bool)) (A B:list X) k:
(forall a b, callTime2 eqbT a b <= k)
-> list_eqbTime eqbT A B <= length A * (k+22) + 9.
Proof.
intros H'. induction A in B|-*.
-cbn. lia.
-destruct B.
{cbn. intuition. }
cbn - [callTime2]. setoid_rewrite IHA.
rewrite H'. ring_simplify. intuition.
Qed.
Lemma list_eqbTime_bound_r (eqbT : timeComplexity (X -> X -> bool)) (A B : list X) f:
(forall (x y:X), callTime2 eqbT x y <= f y) ->
list_eqbTime eqbT A B <= sumn (map f B) + 9 + length B * 22.
Proof.
intros H.
induction A in B|-*;unfold list_eqbTime;fold list_eqbTime. now Lia.lia.
destruct B.
-cbn. Lia.lia.
-rewrite H,IHA. cbn [length map sumn]. Lia.lia.
Qed.
Global Instance eqbList f `{eqbClass (X:=X) f}:
eqbClass (list_eqb f).
Proof.
intros ? ?. eapply list_eqb_spec. all:eauto using eqb_spec.
Qed.
Import EqBool.
Global Instance eqbComp_List `{eqbCompT X (R:=HX)}:
eqbCompT (list X).
Proof.
evar (c:nat). exists c. unfold list_eqb.
unfold enc;cbn.
change (eqb0) with (eqb (X:=X)).
extract. unfold eqb,eqbTime. fold @enc.
recRel_prettify2. easy.
[c]:exact (c__eqbComp X + 6).
all:unfold c. all:cbn iota beta delta [list_enc].
all: change ((match HX with
| @mk_registered _ enc _ _ => enc
end)) with (enc (X:=X)).
all:cbn [size]. all: nia.
Qed.
End int.
From Undecidability.L Require Import UpToC.
From Undecidability.L Require Import Functions.EqBool.
From Undecidability.L.Datatypes Require Export List.List_enc LBool LOptions LNat.
Set Default Proof Using "Type".
Section Fix_X.
Variable (X:Type).
Context {intX : registered X}.
Fixpoint inb eqb (x:X) (A: list X) :=
match A with
nil => false
| a::A' => orb (eqb a x) (inb eqb x A')
end.
Variable X_eqb : X -> X -> bool.
Hypothesis X_eqb_spec : (forall (x y:X), Bool.reflect (x=y) (X_eqb x y)).
Lemma inb_spec: forall x A, Bool.reflect (In x A) (inb X_eqb x A).
Proof using X_eqb_spec.
intros x A. induction A.
-constructor. tauto.
-simpl. destruct (X_eqb_spec a x).
+constructor. tauto.
+inv IHA. destruct (X_eqb_spec a x).
*constructor. tauto.
*constructor. tauto.
*constructor. tauto.
Qed.
Global Instance term_inb: computableTime' inb (fun eq eqT => (5,fun x _ => (1,fun l _ =>
(fold_right (fun x' res => callTime2 eqT x' x
+ res + 17) 4 l ,tt)))).
Proof.
extract.
solverec.
Defined. (*because other extract*)
Global Instance term_inb_notime: computable inb.
Proof.
extract.
Defined. (*because other extract*)
End Fix_X.
Section list_eqb.
Variable X : Type.
Variable eqb : X -> X -> bool.
Variable spec : forall x y, reflect (x = y) (eqb x y).
Fixpoint list_eqb A B :=
match A,B with
| nil,nil => true
| a::A',b::B' => eqb a b && list_eqb A' B'
| _,_ => false
end.
Lemma list_eqb_spec A B : reflect (A = B) (list_eqb A B).
Proof using spec.
revert B; induction A; intros; destruct B; cbn in *; try now econstructor.
destruct (spec a x), (IHA B); cbn; econstructor; congruence.
Qed.
End list_eqb.
Section int.
Context {X : Type}.
Context {HX : registered X}.
Fixpoint list_eqbTime (eqbT: timeComplexity (X -> X -> bool)) (A B:list X) :=
match A,B with
a::A,b::B => callTime2 eqbT a b + 22 + list_eqbTime eqbT A B
| _,_ => 9
end.
Global Instance term_list_eqb : computableTime' (list_eqb (X:=X))
(fun _ eqbT => (1,(fun A _ => (5,fun B _ => (list_eqbTime eqbT A B,tt))))).
Proof.
extract.
solverec.
Qed.
Definition list_eqbTime_leq (eqbT: timeComplexity (X -> X -> bool)) (A B:list X) k:
(forall a b, callTime2 eqbT a b <= k)
-> list_eqbTime eqbT A B <= length A * (k+22) + 9.
Proof.
intros H'. induction A in B|-*.
-cbn. lia.
-destruct B.
{cbn. intuition. }
cbn - [callTime2]. setoid_rewrite IHA.
rewrite H'. ring_simplify. intuition.
Qed.
Lemma list_eqbTime_bound_r (eqbT : timeComplexity (X -> X -> bool)) (A B : list X) f:
(forall (x y:X), callTime2 eqbT x y <= f y) ->
list_eqbTime eqbT A B <= sumn (map f B) + 9 + length B * 22.
Proof.
intros H.
induction A in B|-*;unfold list_eqbTime;fold list_eqbTime. now Lia.lia.
destruct B.
-cbn. Lia.lia.
-rewrite H,IHA. cbn [length map sumn]. Lia.lia.
Qed.
Global Instance eqbList f `{eqbClass (X:=X) f}:
eqbClass (list_eqb f).
Proof.
intros ? ?. eapply list_eqb_spec. all:eauto using eqb_spec.
Qed.
Import EqBool.
Global Instance eqbComp_List `{eqbCompT X (R:=HX)}:
eqbCompT (list X).
Proof.
evar (c:nat). exists c. unfold list_eqb.
unfold enc;cbn.
change (eqb0) with (eqb (X:=X)).
extract. unfold eqb,eqbTime. fold @enc.
recRel_prettify2. easy.
[c]:exact (c__eqbComp X + 6).
all:unfold c. all:cbn iota beta delta [list_enc].
all: change ((match HX with
| @mk_registered _ enc _ _ => enc
end)) with (enc (X:=X)).
all:cbn [size]. all: nia.
Qed.
End int.