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Pairwise swap in data structure in python

# Recursive function to pairwise swap elements of a linked list
def pairWiseSwap(head):
 
    # There must be at-least two nodes in the list
    if (head != None and head.next != None):
  
        # Swap the node's data with data of next node
        swap(head.data, head.next.data);
  
        # Call pairWiseSwap() for rest of the list
        pairWiseSwap(head.next.next);
 
# This code is contributed by _saurabh_jaiswal

Source: geeksforgeeks.org

Pairwise swap in data structure in python

# Python program to swap the elements of linked list pairwise
 
# Node class
 
 
class Node:
 
    # Constructor to initialize the node object
    def __init__(self, data):
        self.data = data
        self.next = None
 
 
class LinkedList:
 
    # Function to initialize head
    def __init__(self):
        self.head = None
 
    # Function to pairwise swap elements of a linked list
    def pairwiseSwap(self):
        temp = self.head
 
        # There are no nodes in linked list
        if temp is None:
            return
 
        # Traverse furthethr only if there are at least two
        # left
        while(temp and temp.next):
 
            # If both nodes are same,
            # no need to swap data
            if(temp.data != temp.next.data):
 
                # Swap data of node with its next node's data
                temp.data, temp.next.data = temp.next.data, temp.data
 
            # Move temp by 2 to the next pair
            temp = temp.next.next
 
    # Function to insert a new node at the beginning
    def push(self, new_data):
        new_node = Node(new_data)
        new_node.next = self.head
        self.head = new_node
 
    # Utility function to print the linked LinkedList
    def printList(self):
        temp = self.head
        while(temp):
            print temp.data,
            temp = temp.next
 
 
# Driver program
llist = LinkedList()
llist.push(5)
llist.push(4)
llist.push(3)
llist.push(2)
llist.push(1)
 
print "Linked list before calling pairWiseSwap() "
llist.printList()
 
llist.pairwiseSwap()
 
print "\nLinked list after calling pairWiseSwap()"
llist.printList()
 
# This code is contributed by Nikhil Kumar Singh(nickzuck_007)

Source: geeksforgeeks.org

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