iOS

[Question]: Given a linked list where every node represents a linked list and contains two pointers of its type:  Condition: All linked lists are sorted and the resultant linked list should also be sorted

[Question]: Given the head of a linked list, rotate the list to the right by k places.Example: – Input: head = [1,2,3,4,5], k = 2 Output: [4,5,1,2,3] #Approach Step: 1 Create tail node which moves till endsStep: 2 Create curr the tail node is the (len-k)-th node (1st node is head)Step: 3 Reorder linked list

[Question]: Given the head of a linked list, reverse the nodes of the list k at a time, and return the updated list. k is a positive integer and is less than or equal to the length of the linked list. If the number of nodes is not a multiple of k then left-out nodes, in the end, should remain as it is.

[Question]: Create a deep copy of the linked list. which consist of exactly n fresh new nodes, where each new node has its value set to the value of its corresponding original node. Both the next and random pointer of the new nodes should point to new nodes in the copied list such that the pointers in the original list and copied list represent

[Question]: Given a sorted doubly linked list head. Remove duplicate nodes from the given list. #Approach: Step 1: Compare current node item with next node item Step 2: If two items same move next pointer to next’s nextStep 3: If current Node & next Node doesn’t match use node = next

[Question]: Given a sorted doubly linked list of positive distinct elements, Find pairs in a doubly-linked list whose sum is equal to given value k, without using any extra space?  #Approach. Using two pointer

[Question]: Given a doubly linked list and a key x. The problem is to delete all occurrences of the given key x from the doubly linked list. #Approach: we declare two variable prevNode and nxtNode and in a loop if we finds the data value of linklist node is equals to k just break link to the node.

[Question]: Number is represented in linked list such that each digit corresponds to a node in linked list. Add 1 to it. For example 1999 is represented as (1-> 9-> 9 -> 9) and adding 1 to it should change it to (2->0->0->0)  #Approach:

[Question]: Given a singly linked list head sort it with with all with zeros, ones and two’sExample:Input: 1 -> 1 -> 2 -> 0 -> 2 -> 0 -> 1 -> NULL Output: 0 -> 0 -> 1 -> 1 -> 1 -> 2 -> 2 -> NULL Approach: Create count array which stores count of 0’s, 1’s