Merge Two Sorted Lists 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 Merge Two Sorted Lists 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.

Use “Ctrl+F” To Find Any Questions Answer. & For Mobile User, You Just Need To Click On Three dots In Your Browser & You Will Get A “Find” Option There. Use These Option to Get Any Random Questions Answer.

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 – Merge Two Sorted Lists– LeetCode Problem

Merge Two Sorted Lists– LeetCode Problem

Problem:

You are given the heads of two sorted linked lists list1 and list2.

Merge the two lists in a one sorted list. The list should be made by splicing together the nodes of the first two lists.

Return the head of the merged linked list.

Example 1:

Input: list1 = [1,2,4], list2 = [1,3,4]
Output: [1,1,2,3,4,4]

Example 2:

Input: list1 = [], list2 = []
Output: []

Example 3:

Input: list1 = [], list2 = [0]
Output: [0]

Constraints:

  • The number of nodes in both lists is in the range [0, 50].
  • -100 <= Node.val <= 100
  • Both list1 and list2 are sorted in non-decreasing order.
Merge Two Sorted Lists– LeetCode Solutions
class Solution {
 public:
  ListNode* mergeTwoLists(ListNode* l1, ListNode* l2) {
    if (!l1 || !l2)
      return l1 ? l1 : l2;

    if (l1->val > l2->val)
      swap(l1, l2);
    l1->next = mergeTwoLists(l1->next, l2);

    return l1;
  }
};
class Solution {
  public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
    if (l1 == null || l2 == null)
      return l1 == null ? l2 : l1;

    if (l1.val > l2.val) {
      ListNode temp = l1;
      l1 = l2;
      l2 = temp;
    }
    l1.next = mergeTwoLists(l1.next, l2);

    return l1;
  }
}
class Solution:
  def mergeTwoLists(self, l1: ListNode, l2: ListNode) -> ListNode:
    if not l1 or not l2:
      return l1 if l1 else l2

    if l1.val > l2.val:
      l1, l2 = l2, l1
    l1.next = self.mergeTwoLists(l1.next, l2)

    return l1

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