Given a singly singly linked list and an integer K, the task is to rotate the linked list clockwise to the right by K places.
Input: 1 -> 2 -> 3 -> 4 -> 5 -> NULL, K = 2
Output: 4 -> 5 -> 1 -> 2 -> 3 -> NULL
Input: 7 -> 9 -> 11 -> 13 -> 3 -> 5 -> NULL, K = 12
Output: 7 -> 9 -> 11 -> 13 -> 3 -> 5 -> NULL
Approach: To rotate the linked list first check whether the given k is greater than the count of nodes in the linked list or not. Traverse the list and find the length of the linked list then compare it with k, if less then continue otherwise deduce it in the range of linked list size by taking modulo with the length of the list.
After that subtract the value of k from the length of the list. Now, the question has been changed to the left rotation of the linked list so follow that procedure:
- Change the next of the kth node to NULL.
- Change the next of the last node to the previous head node.
- Change the head to (k+1)th node.
In order to do that, the pointers to the kth node, (k+1)th node and last node are required.
Below is the implementation of the above approach:
4 -> 5 -> 1 -> 2 -> 3 -> NULL
Time Complexity: O(n) where n is the number of nodes in Linked List.
- Clockwise rotation of Doubly Linked List by N places
- Create new linked list from two given linked list with greater element at each node
- Convert singly linked list into circular linked list
- XOR Linked List – A Memory Efficient Doubly Linked List | Set 2
- XOR Linked List - A Memory Efficient Doubly Linked List | Set 1
- Difference between Singly linked list and Doubly linked list
- Merge a linked list into another linked list at alternate positions
- Convert Singly Linked List to XOR Linked List
- Check if a linked list is Circular Linked List
- Left Rotation and Right Rotation of a String
- Construct a Maximum Sum Linked List out of two Sorted Linked Lists having some Common nodes
- Create a linked list from two linked lists by choosing max element at each position
- Length of longest palindrome list in a linked list using O(1) extra space
- Partitioning a linked list around a given value and If we don't care about making the elements of the list "stable"
- Rotate the sub-list of a linked list from position M to N to the right by K places
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