Rotate List Leetcode Solution

The problem Rotate List Leetcode Solution provides us a linked list and an integer. We are told to rotate the linked list to the right by k places. So if we rotate a linked list k places to the right, in each step we take the last element from the list and place it in from. We repeat this until we have done k number of these operations. Let's take a look at a few examples.

head = , k = 2

 

Explanation: Let's break the operation into 2 simple rotation operations. So, in the first step or move, we simply take the element from the end of the list and place it in front. So, the list becomes . Now, again we repeat the same operation making the list, . And hence the answer.

head = , k = 4

 

Explanation: Repeating the process 4 times result in the answer linked list. It can be better understood by looking at the image below.

 

Approach for Rotate List Leetcode Solution

The problem Rotate List Leetcode Solution states that you are given a linked list with an integer for rotation. This means that we need to rotate the list k places to the right. The problem can be understood by a simple operation of taking the elements from the end of the list and placing them in front. Since there is no way to efficiently remove an element from the end and place it in front. We need to think of any other way to perform the operation. If we observe, we can see that after performing k operations, k elements from the end are removed and are placed in front.

 

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Done