When it is required to check if two linked lists are same, a method to add elements to the linked list, and a method to check the equality of the elements in the linked lists are defined.
Below is a demonstration for the same −
Example
class Node:
def __init__(self, data):
self.data = data
self.next = None
class LinkedList_structure:
def __init__(self):
self.head = None
self.last_node = None
def add_vals(self, data):
if self.last_node is None:
self.head = Node(data)
self.last_node = self.head
else:
self.last_node.next = Node(data)
self.last_node = self.last_node.next
def check_equality(list_1, list_2):
curr_1 = list_1.head
curr_2 = list_2.head
while (curr_1 and curr_2):
if curr_1.data != curr_2.data:
return False
curr_1 = curr_1.next
curr_2 = curr_2.next
if curr_1 is None and curr_2 is None:
return True
else:
return False
my_linked_list_1 = LinkedList_structure()
my_linked_list_2 = LinkedList_structure()
my_list = input('Enter the elements of the first linked list: ').split()
for elem in my_list:
my_linked_list_1.add_vals(int(elem))
my_list = input('Enter the elements of the second linked list: ').split()
for elem in my_list:
my_linked_list_2.add_vals(int(elem))
if check_equality(my_linked_list_1, my_linked_list_2):
print('The two linked lists are the same')
else:
print('The two linked list are not same')Output
Enter the elements of the first linked list: 34 56 89 12 45 Enter the elements of the second linked list: 57 23 78 0 2 The two linked list are not same
Explanation
The ‘Node’ class is created.
Another ‘LinkedList_structure’ class with required attributes is created.
It has an ‘init’ function that is used to initialize the first element, i.e the ‘head’ to ‘None’ and ‘last_node’ to ‘None’.
A method named ‘add_vals’ is defined, that helps add a value to the stack.
Another method named ‘check_equality’ is defined, that helps check if elements in two linked list are same or not.
It returns True or False depending on the equality.
Two instances of the ‘LinkedList_structure’ are created.
Elements are added to the two linked lists.
The ‘check_equality’ method is called on these two linked lists.
The output is displayed on the console.