Circular Linked List#
A circular linked list is a variation of a linked list where the last node points back to the first node, forming a closed loop. Unlike regular linked lists, it does not contain any Null pointers at the end.
Core Variations#
A circular singly linked list is a linear data structure where the last node points back to the first node (Head) instead of pointing to Null. Each node contains a single “data” field and a single Next pointer, forming a continuous, closed loop.
A circular doubly linked list is a complex linear data structure where each node contains a data field and two pointers (Next and Previous), and the list forms a continuous loop. Specifically the Next pointer of the last node points back to the first node, and the Previous pointer of the first node points back to the last node.
Advantages/Disadvantages#
- Continuous Loop
Ideal for lists that need to cycle repeatedly without resetting a pointer back to the start.
- Fast Insertions
Instantaenous front and back operations (\(O(1)\)) when maintaining a
Tailpointer.- No Null Pointer Errors
Reduces specific boundary-check bugs.
- Infinite Loop Risk
If the stopping condition (checking if you are back at the starting node) is written incorrectly, code will run forever.
- Complex Code
Harder to reverse of split compared to a simple linear list.