Clone Linked List with Random Pointer | LeetCode 138 | Day 29 of DSA with Java
Welcome to Day 29 of 100 Days of DSA with Java.
In this video, we solve an important linked list problem: Clone a Linked List with Random Pointer.
In this problem, each node has two pointers:
next — points to the next node
random — points to any random node in the list or null
Our goal is to create a deep copy of the linked list, meaning every node in the copied list should be a brand-new node, but the next and random connections should match the original list structure.
We solve this problem using the HashMap approach, where we first create copies of all nodes and then connect their next and random pointers in the second pass.
Problem Covered:
LeetCode 138 Pattern — Copy List with Random Pointer
Topics Covered:
Linked List with random pointer
Deep copy of linked list
Difference between original and cloned list
HashMap approach
Copying next pointer
Copying random pointer
Java implementation
Linked list interview problem
LeetCode 138 pattern explanation
By the end of this video, you’ll clearly understand how to clone a linked list with random pointers using HashMap and why deep copy is important in linked list problems.
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