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June 29, 2020 08:00
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Singly linked list
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class Node: | |
def __init__(self, data): | |
self.data = data | |
self.next = None | |
class LinkedList: | |
def __init__(self): | |
self.head = None | |
def display(self): | |
currentNode = self.head | |
while currentNode: | |
print(currentNode.data) | |
# quit() | |
currentNode = currentNode.next | |
def prepend(self,data): | |
newNode = Node(data) | |
newNode.next = self.head | |
self.head = newNode | |
def insertAfter(self, previousNode, data): | |
if not previousNode: | |
print('send prev node') | |
return | |
newNode = Node(data) | |
newNode.next = previousNode.next | |
previousNode.next = newNode | |
def append(self, data): | |
newNode = Node(data); | |
if self.head is None: | |
self.head = newNode | |
return; | |
lastNode = self.head | |
while lastNode.next: | |
lastNode = lastNode.next | |
lastNode.next = newNode; | |
llist = LinkedList() | |
llist.append("A") | |
llist.append("B") | |
llist.append("C") | |
llist.prepend("D") | |
llist.insertAfter(llist.head.next,"E") | |
llist.display() |
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