Rotate List LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]

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Hello Programmers/Coders, Today we are going to share solutions to the Programming problems of LeetCode Solutions in C++, Java, & Python. At Each Problem with Successful submission with all Test Cases Passed, you will get a score or marks and LeetCode Coins. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for the Rotate List in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.

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About LeetCode

LeetCode is one of the most well-known online judge platforms to help you enhance your skills, expand your knowledge and prepare for technical interviews. 

LeetCode is for software engineers who are looking to practice technical questions and advance their skills. Mastering the questions in each level on LeetCode is a good way to prepare for technical interviews and keep your skills sharp. They also have a repository of solutions with the reasoning behind each step.

LeetCode has over 1,900 questions for you to practice, covering many different programming concepts. Every coding problem has a classification of either Easy, Medium, or Hard.

LeetCode problems focus on algorithms and data structures. Here is some topic you can find problems on LeetCode:

  • Mathematics/Basic Logical Based Questions
  • Arrays
  • Strings
  • Hash Table
  • Dynamic Programming
  • Stack & Queue
  • Trees & Graphs
  • Greedy Algorithms
  • Breadth-First Search
  • Depth-First Search
  • Sorting & Searching
  • BST (Binary Search Tree)
  • Database
  • Linked List
  • Recursion, etc.

Leetcode has a huge number of test cases and questions from interviews too like Google, Amazon, Microsoft, Facebook, Adobe, Oracle, Linkedin, Goldman Sachs, etc. LeetCode helps you in getting a job in Top MNCs. To crack FAANG Companies, LeetCode problems can help you in building your logic.

Link for the Problem – Rotate List– LeetCode Problem

Rotate List– LeetCode Problem

Problem:

Given the head of a linked list, rotate the list to the right by k places.

Example 1:

rotate1
Input: head = [1,2,3,4,5], k = 2
Output: [4,5,1,2,3]

Example 2:

roate2
Input: head = [0,1,2], k = 4
Output: [2,0,1]

Constraints:

  • The number of nodes in the list is in the range [0, 500].
  • -100 <= Node.val <= 100
  • 0 <= k <= 2 * 109
Rotate List– LeetCode Solutions
Rotate List in C++:
class Solution {
 public:
  ListNode* rotateRight(ListNode* head, int k) {
    if (!head || !head->next || k == 0)
      return head;

    ListNode* tail;
    int length = 1;
    for (tail = head; tail->next; tail = tail->next)
      ++length;
    tail->next = head;  // circle the list

    const int t = length - k % length;
    for (int i = 0; i < t; ++i)
      tail = tail->next;
    ListNode* newHead = tail->next;
    tail->next = nullptr;

    return newHead;
  }
};
Rotate List in Java:
class Solution {
  public ListNode rotateRight(ListNode head, int k) {
    if (head == null || head.next == null || k == 0)
      return head;

    int length = 1;
    ListNode tail = head;
    for (; tail.next != null; tail = tail.next)
      ++length;
    tail.next = head; // circle the list

    final int t = length - k % length;
    for (int i = 0; i < t; ++i)
      tail = tail.next;
    ListNode newHead = tail.next;
    tail.next = null;

    return newHead;
  }
}
Rotate List in Python:
class Solution:
  def rotateRight(self, head: ListNode, k: int) -> ListNode:
    if not head or not head.next or k == 0:
      return head

    tail = head
    length = 1
    while tail.next:
      tail = tail.next
      length += 1
    tail.next = head  # circle the list

    t = length - k % length
    for _ in range(t):
      tail = tail.next
    newHead = tail.next
    tail.next = None

    return newHead

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