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Python program to sort the elements of the Circular Linked List
When it is required to sort the elements of a circular linked list, a ‘Node’ class needs to be created. In this class, there are two attributes, the data that is present in the node, and the access to the next node of the linked list.
In a circular linked list, the head and the rear are adjacent to each other. They are connected to form a circle, and don’t have ‘NULL’ value in the last node.
Another ‘linked_list’ class needs to be created that would have an initialization function, and the head of the node would be initialized to ‘None’.
Multiple methods are defined by the user to add node to the linked list, sort the linked list in ascending or descending order and to print the node values.
Below is a demonstration for the same −
Example
class Node:
def __init__(self,data):
self.data = data
self.next = None
class list_creation:
def __init__(self):
self.head = Node(None)
self.tail = Node(None)
self.head.next = self.tail
self.tail.next = self.head
def add_data(self,my_data):
new_node = Node(my_data)
if self.head.data is None:
self.head = new_node
self.tail = new_node
new_node.next = self.head
else:
self.tail.next = new_node
self.tail = new_node
self.tail.next = self.head
def sort_list(self):
curr = self.head
if(self.head == None):
print("The list is empty")
else:
while(True):
index_val = curr.next
while(index_val != self.head):
if(curr.data > index_val.data):
temp = curr.data
curr.data = index_val.data
index_val.data = temp
index_val = index_val.next
curr =curr.next
if(curr.next == self.head):
break;
def print_it(self):
curr = self.head
if self.head is None:
print("The list is empty");
return;
else:
print(curr.data)
while(curr.next != self.head):
curr = curr.next
print(curr.data)
print("\n")
class circular_linked_list:
my_cl = list_creation()
print("Nodes are being added to the list")
my_cl.add_data(21)
my_cl.add_data(54)
my_cl.add_data(78)
my_cl.add_data(99)
my_cl.add_data(27)
print("The list is :")
my_cl.print_it()
print("The list is being sorted")
my_cl.sort_list()
print("The sorted list is : ")
my_cl.print_it()Output
Nodes are being added to the list The list is : 21 54 78 99 27 The list is being sorted The sorted list is : 21 27 54 78 99
Explanation
- The ‘Node’ class is created.
- Another class with required attributes is created.
- Another method named ‘sort_list’ is defined, that is used to sort the elements in the circular linked list in an ascending or descending order.
- Another method named ‘print_it’ is defined, that displays the nodes of the circular linked list.
- An object of the ‘list_creation’ class is created, and the methods are called on it to add data.
- An ‘init’ method is defined, that the first and last nodes of the circular linked list to None.
- The ‘sort_list’ method is called.
- It iterates through the list, and places the elements in their relevant position based on the value.
- This is displayed on the console using the ‘print_it’ method.
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