Union of Two Linked Lists | GeeksforGeeks GFG Solution in C++ | Linked List DSA

In this video, we solve the GeeksforGeeks problem "Union of Two Linked Lists".

🔗 Problem Link:
https://www.geeksforgeeks.org/problems/union-of-two-linked-list/1?sortBy=submissions&category%255B%255D=Linked%2520List&page=2&difficulty%255B%255D=0

📌 Problem Statement:

Given two singly linked lists, create a new linked list that contains the union of elements present in both lists.

👉 Each element should appear only once (no duplicates)
👉 First include elements from the first list in order
👉 Then include elements from the second list that are not already present

📌 Example:

Input:
head1 = 9 - 6 - 4 - 2 - 3 - 8
head2 = 1 - 2 - 8 - 6 - 2

Output:
9 - 6 - 4 - 2 - 3 - 8 - 1

Explanation:
All distinct nodes of the first list are taken first.
Then only those nodes from the second list are added which are not already present.

🎯 In this video you will learn:

✔ How to find union of two linked lists
✔ Handling duplicates efficiently
✔ Using hashing or set for optimization
✔ Maintaining order of elements
✔ Important interview problem on linked lists

💻 Language Used: C++
📚 Platform: GeeksforGeeks
📂 Topic: Linked List

Tags:
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