Mastering Linked Lists: Core Concepts and Three Essential LeetCode Problems
1. Linked-list fundamnetals
A linked list is a linear collection of nodes where each node stores:
value – the payload
next – a pointer to the following node (or nullptr)
Variants:
Singly linked list – one pointer per node
Doubly linked list – prev + next
Circular linked list – tail points back to head
Memory is non-contiguous; traversal is ...
Posted on Wed, 02 Sep 2026 16:43:57 +0000 by ramjai
Implementing Deep Copy for Linked Lists with Random Pointers
The algorithm works in three phases:
Duplicate each node and insert it immediately after its original
Copy the random pointers from original nodes to their duplicates
Separate the interleaved lists into original and copy
C++ Implementation
class LinkedListCloner {
public:
Node* cloneList(Node* head) {
if (!head) return nullptr;
...
Posted on Mon, 29 Jun 2026 17:41:23 +0000 by bmdsherman