How do you write a function that can reverse a linked list?

Iterative Method

  1. Initialize three pointers prev as NULL, curr as head and next as NULL.
  2. Iterate through the linked list. In loop, do following. // Before changing next of current, // store next node. next = curr->next. // Now change next of current. // This is where actual reversing happens. curr->next = prev.

Can you reverse linked list?

The recursive approach to reverse a linked list is simple, just we have to divide the linked lists in two parts and i.e first node and the rest of the linked list, and then call the recursion for the other part by maintaining the connection.

How do you reverse a singly linked list in C?

Reversing a singly linked list (Recursive approach)

  1. Break the linked list into two parts – first node and rest of the linked list.
  2. Call reverse function for rest of the linked list.
  3. Link rest and first.
  4. Change the head pointer.

How do you recursively reverse a linked list in C?

The general recursive algorithm for this is:

  1. Divide the list in 2 parts – first node and rest of the list.
  2. Recursively call reverse for the rest of the linked list.
  3. Link rest to first .
  4. Fix head pointer.

Is reversing linked list difficult?

Actually it is harder than that, but it isn’t hard. We started with reverse a linked list and were told it was too easy. Since sorting can be done in ALMOST the same way as reversing, it seemed to be a reasonable step up. I’ve read that link and he doesn’t have a problem with sorting/reversing linked list problems.

How do you reverse a linked list in less than on time?

No, we cannot reverse a linked list in O(n) time, because each pointer must be reversed or values must be interchanged to reverse a linked list. To do that we need to reach the last node which takes a pointer to reach last node which takes O(n) time. It can`t even be done by using recursive and iterative methods.

How do you reverse a single linked list in CPP?

Solution 1: Reverse a linked list using iteration

  1. temp = current->next; Assigns temp node to the current node’s next node.
  2. current->next = prev; Assigns current node to the previous node’s next node.
  3. prev = current; Increments previous node to current node.
  4. current = temp; Increments current node to temp node.

How do you traverse a linked list?

You can add elements to either the beginning, middle or end of the linked list.

  1. Insert at the beginning. Allocate memory for new node. Store data. Change next of new node to point to head.
  2. Insert at the End. Allocate memory for new node. Store data. Traverse to last node.
  3. Insert at the Middle.