What is a Linked List?

A linked list is a data structure where each element (node) contains data and a reference to the next node. Think of it like a treasure hunt: each clue points to the next location, and you follow the chain to find all the treasures.

Structure:

• Node: Contains data and a pointer to the next node
• Head: The first node in the list
• Tail: The last node (points to null/nothing)

Types:

• Singly linked: Each node points to the next
• Doubly linked: Each node points to both next and previous
• Circular: The last node points back to the first

Advantages:

• Dynamic size: Grows and shrinks as needed
• Easy insertion/deletion: Just update pointers
• No wasted space: Only uses memory for what you store

Disadvantages:

• No random access: Can't jump to index 5 directly
• Extra memory: Need to store pointers
• Slower traversal: Must follow the chain

FAQ

When should I use a linked list vs an array?

Use arrays when you need random access. Use linked lists when you frequently insert/delete from the middle and don't need random access.

Are linked lists faster than arrays?

It depends. Arrays are faster for access, linked lists are faster for insertion/deletion in the middle (no shifting needed).