Représentation des graphes
Les différentes représentations des graphes
Afin de le représenter en Python, on peut utiliser une matrice d'adjacence ou de listes de successeurs.
La matrice d'adjacence est une matrice carrée dont chaque ligne et chaque colonne correspond à un sommet. Il y a un \(1\) sur la ligne du sommet \(i\) et de la colonne \(j\) si et seulement s'il y a un arc reliant \(i\) à \(j\) .
Le dictionnaire de successeurs associe à chaque sommet \(i\) la liste des sommets \(j\) tels qu'il y a un arc entre \(i\) et \(j\) . Voici les 3 représentations d'un même graphe.
En Python, on peut utiliser des tableaux Ă deux dimensions pour les matrices et des dictionnaires associant Ă chaque sommet des listes pour les listes de successeurs.
Matrice d'adjacence graphe1_matrice = [[ 0 , 1 , 1 , 0 ],
[ 0 , 0 , 1 , 0 ],
[ 1 , 1 , 0 , 0 ],
[ 0 , 1 , 1 , 0 ]]
Dictionnaire de successeurs graphe1_successeurs = { 0 : [ 1 , 2 ],
1 : [ 2 ],
2 : [ 0 , 1 ],
3 : [ 1 , 2 ]}
Exercice 1
On considère le graphe suivant, que l'on appellera graphe2
:
Écrire les représentations du graphe sous forme de matrice et de dictionnaire de successeurs :
Exercice 2
Écrire le code de la fonction matrice_vers_dico
qui permet de passer d'une matrice d'adjacence Ă un dictionnaire de successeurs.
Exemple >>> matrice_vers_dico ( graphe1_matrice )
{ 0 : [ 1 , 2 ], 1 : [ 2 ], 2 : [ 0 , 1 ], 3 : [ 1 , 2 ]}
Exercice 3
Écrire le code de la fonction dico_vers_matrice
qui permet de passer d'un dictionnaire de successeurs Ă une matrice. On supposera que tous les sommets du graphe apparaissent comme clef du dictionnaire, mĂŞme s'ils n'ont pas de successeurs.
Exemple >>> dico_vers_matrice ( graphe1_matrice )
[[ 0 , 1 , 1 , 0 ], [ 0 , 0 , 1 , 0 ], [ 1 , 1 , 0 , 0 ], [ 0 , 1 , 1 , 0 ]]
Explications de l'algorithme
Au début, on crée une matrice contenant uniquement des 0 puis on rajoute les 1 pour les cases correspondant à la ligne sommet
et la colonne voisin
pour tous les voisins de chaque sommet.
Liste d'adjacence
Lorsque les sommets d'un graphe sont numérotés à partir de 0, on peut le représenter à l'aide d'une liste d'adjacence . Pour chaque indice, la liste d'adjacence contient la liste des successeurs. Si on a le dictionnaire de successeurs, le passage à la liste d'adjacence est très simple :
Exemple avec le graphe1 graphe1_successeurs = { 0 : [ 1 , 2 ],
1 : [ 2 ],
2 : [ 0 , 1 ],
3 : [ 1 , 2 ]}
graphe1_adjacence = [[ 1 , 2 ], [ 2 ], [ 0 , 1 ], [ 1 , 2 ]]
Exercice 4
Écrire le code de la fonction dico_vers_adjacence
qui prend en paramètre un dictionnaire de successeurs et qui renvoie la liste d'adjacence. On supposera que tous les sommets du graphe apparaissent comme clef du dictionnaire, même s'ils n'ont pas de successeurs.
Exemple avec le graphe 1 >>> graphe1_dico = { 0 : [ 1 , 2 ], 1 : [ 2 ], 2 : [ 0 , 1 ], 3 : [ 1 , 2 ]}
>>> dico_vers_adjacence ( graphe1_dico )
[[ 1 , 2 ], [ 2 ], [ 0 , 1 ], [ 1 , 2 ]]
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Exercice 5
Écrire le code de la fonction adjacence_vers_dico
qui prend en paramètre une liste d'adjacence et renvoie le dictionnaire de successeurs.
Exemple avec le graphe 1 >>> graphe1_adjacence = [[ 1 , 2 ], [ 2 ], [ 0 , 1 ], [ 1 , 2 ]]
>>> adjacence_vers_dico ( graphe1_adjacence )
{ 0 : [ 1 , 2 ], 1 : [ 2 ], 2 : [ 0 , 1 ], 3 : [ 1 , 2 ]}
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909.43930.43990.43930.43910.43985.43908.43927.43979.43976.43993.43990.43910.43928.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43991.43983.43930.43910.43985.43990.43908.43927.43979.43976.43993.43990.43910.43928.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43990.43994.43930.43910.43978.43993.43990.43999.43997.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43920.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43990.43994.43930.43910.43988.43997.43990.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43920.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43990.43930.43910.43988.43985.43979.43980.43997.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43921.43921.43973.43908.43927.43979.43976.43993.43990.43910.43954.43908.43927.43995.43991.43996.43997.43910.43908.43927.43976.43978.43997.43910.43908.43927.43996.43985.43982.43910.43908.43927.43980.43996.43910.43908.43927.43980.43978.43910.43908.43927.43980.43993.43994.43988.43997.43910.43908.43927.43996.43985.43982.43910.43954.43908.43927.43996.43985.43982.43910.43954.43908.43927.43996.43997.43980.43993.43985.43988.43979.43910
Version orientée objet
Afin de permettre de créer facilement des graphes, le plus simple est de créer une classe pour cela.
Lorsqu'on ajoute un arc, on rajoute automatiquement les sommets s'ils ne sont pas déjà dans le graphe.
On trie la liste des sommets lorsqu'on nous la demande et la liste des voisins à chaque ajout pour simplifier les vérifications, mais ce n'est pas une obligation.
La classe Graphe class Graphe :
def __init__ ( self ):
self . vois = dict ()
def ajoute_sommet ( self , s ):
if s not in self . vois :
self . vois [ s ] = []
def ajoute_arc ( self , s1 , s2 ):
self . ajoute_sommet ( s1 )
self . ajoute_sommet ( s2 )
self . vois [ s1 ] . append ( s2 )
self . vois [ s1 ] . sort ()
def sommets ( self ):
return self . vois
def voisins ( self , s ):
return sorted ( self . vois [ s ])
On peut alors définir le graphe 1 ainsi :
DĂ©finition du graphe 1 graphe1 = Graphe ()
graphe1 . ajoute_arc ( 0 , 1 )
graphe1 . ajoute_arc ( 0 , 2 )
graphe1 . ajoute_arc ( 1 , 2 )
graphe1 . ajoute_arc ( 2 , 0 )
graphe1 . ajoute_arc ( 2 , 1 )
graphe1 . ajoute_arc ( 3 , 1 )
graphe1 . ajoute_arc ( 3 , 2 )
Exercice 6
En utilisant la classe Graphe
(qui est déjà définie dans l'IDE), définir le graphe 3 présenté ci-dessous.
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3.43979.43979.43909.43930.43990.43930.43910.43993.43986.43991.43981.43980.43997.44007.43993.43978.43995.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43920.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43989.43985.43930.43910.43913.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43924.43908.43927.43979.43976.43993.43990.43910.43928.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43989.43985.43930.43910.43915.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43921.43908.43927.43979.43976.43993.43990.43910.43954.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43990.43930.43910.43999.43978.43993.43976.43984.43997.43915.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43991.43930.43910.43926.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43990.43930.43910.43993.43986.43991.43981.43980.43997.44007.43993.43978.43995.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43920.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43989.43985.43930.43910.43914.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43924.43908.43927.43979.43976.43993.43990.43910.43928.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43989.43985.43930.43910.43912.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43921.43908.43927.43979.43976.43993.43990.43910.43954.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43990.43930.43910.43999.43978.43993.43976.43984.43997.43915.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43991.43930.43910.43926.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43990.43930.43910.43993.43986.43991.43981.43980.43997.44007.43993.43978.43995.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43920.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43989.43985.43930.43910.43914.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43924.43908.43927.43979.43976.43993.43990.43910.43928.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43989.43985.43930.43910.43915.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43921.43908.43927.43979.43976.43993.43990.43910.43954.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43990.43930.43910.43999.43978.43993.43976.43984.43997.43915.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43991.43930.43910.43926.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43990.43930.43910.43993.43986.43991.43981.43980.43997.44007.43993.43978.43995.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43920.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43989.43985.43930.43910.43915.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43924.43908.43927.43979.43976.43993.43990.43910.43928.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43989.43985.43930.43910.43913.43908.43927.43979.43976.43993.43990.43910.43908.43979.43976.43993.43990.43928.43995.43988.43993.43979.43979.43909.43930.43976.43930.43910.43921.43908.43927.43979.43976.43993.43990.43910.43954.43908.43927.43995.43991.43996.43997.43910.43908.43927.43976.43978.43997.43910.43908.43927.43996.43985.43982.43910.43908.43927.43980.43996.43910.43908.43927.43980.43978.43910.43908.43927.43980.43993.43994.43988.43997.43910.43908.43927.43996.43985.43982.43910.43954.43908.43927.43996.43985.43982.43910.43954.43908.43927.43996.43997.43980.43993.43985.43988.43979.43910
# Tests
(insensible Ă la casse)(Ctrl+I)