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Verified Commit 41708b2a authored by orestis.malaspin's avatar orestis.malaspin
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added queue

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slides/cours_9.md
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...@@ -715,9 +715,9 @@ typedef struct _queue { // File d'attente: ...@@ -715,9 +715,9 @@ typedef struct _queue { // File d'attente:
```C ```C
void queue_init(queue *fa); // head = tail = NULL void queue_init(queue *fa); // head = tail = NULL
bool queue_is_empty(queue fa); // checks if queue is empty bool queue_is_empty(queue fa); // fa.head == fa.tail == NULL
int queue_tail(queue fa); // returns the value of the tail int queue_tail(queue fa); // return fa.head->data
int queue_head(queue fa); // returns the value of the head int queue_head(queue fa); // return fa.tail->data
``` ```
## Manipulations et destruction ## Manipulations et destruction
...@@ -748,22 +748,197 @@ vide.](./figs/fig_empty_queue_insert.png){width=40%} ...@@ -748,22 +748,197 @@ vide.](./figs/fig_empty_queue_insert.png){width=40%}
![Insertion dans une file d'attente ![Insertion dans une file d'attente
non-vide.](./figs/fig_non_empty_queue_insert.png){width=70%} non-vide.](./figs/fig_non_empty_queue_insert.png){width=70%}
<!-- # Défilage --> # Enfilage
## Live (implémentation)
. . .
```C
```
# Défilage
## Trois cas différents
1. La file a plus d'un élément (faire un dessin):
. . .
![Extraction d'une file d'attente](./figs/fig_queue_extract.png){width=80%}
2. La file un seul élément (faire un dessin):
. . .
![Extraction d'une file d'attente de longueur 1.](./figs/fig_queue_extract_one.svg){width=25%}
3. La file est vide (problème)
# Défilage
## Live (implémentation)
. . .
```C
```
# Destruction
## Comment on faire la désallocation?
. . .
On défile jusqu'à ce que la file soit vide!
# Complexité
## Quelle sont les complexité de:
* Enfiler?
. . .
* Dépiler?
. . .
* Détruire?
. . .
* Est vide?
# Implémentation alternative
## Comment implémenter la file auterment?
. . .
* Données stockées dans un tableau;
* Tableau de taille connue à la compilation ou pas (reallouable);
* `head` et `tail` seraient les indices du tableau;
* `capacity` seraient la capacité maximale;
. . .
## Structure de données
```C
typedef struct _queue {
int *data;
int head, tail, capacity;
} queue;
```
# File basée sur un tableau
* Initialisation?
. . .
```C
```
<!-- Voici l'entête de la procédure: `int queue_extraire(queue* fa);` --> * Est vide?
. . .
```C
```
* Empiler?
. . .
```C
```
* Dépiler?
. . .
```C
```
# Complexité
## Quelle sont les complexité de:
* Initialisation?
. . .
```C
<!-- On commence par récupérer, la valeur en tête de file d'attente via l'appel `queue_tete(*fa);` -->
<!-- Puis on met un pointeur temporaire sur l'élément en tête, avant de déplacer le pointeur de tête sur l'élément suivant. -->
<!-- Finalement, on désalloue la mémoire -->
<!-- ![Extraction d'une file d'attente](./figures/fig_queue_extract.png) -->
<!-- Si la file d'attente n'avait qu'un seul élément, alors il faudrait mettre le pointeur `fa-­>debut` à `NULL`. --> ```
<!-- Dans ce cas, à la suite du point (3), le pointeur `fa-­>tete` se retrouve à `NULL`. On doit donc ajouter l'instruction : -->
* Est vide?
. . .
```C
```
* Empiler?
. . .
```C
```
* Dépiler?
. . .
```C
```
# File basée sur un tableau (git)
* Créons le squelette et `Makefile` ensemble.
. . .
* Créons quelques issues et assignons les!
<!-- ```C -->
<!-- if (NULL == fa­>tete) { -->
<!-- fa­>debut = NULL; -->
<!-- } -->
<!-- ``` -->
slides/figs/fig_queue_extract.png 0 → 100644
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slides/figs/fig_queue_extract.png

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slides/figs/fig_queue_extract_one.svg 0 → 100644
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