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Data Structures & Algorithms · Module 4 of 10

Linked lists

Use nodes connected by pointers.

📖 Key ideas

Each node stores data and a pointer to the next node.
Singly, doubly and circular linked lists.
Insert/delete at a known position is O(1); search is O(n).
No random access by index.
Classic problems: reverse a list, detect cycle, find middle.

💡 Real-life example: A linked list is a treasure hunt: each clue tells you where the next one is.

NodeElement with data and pointer

HeadFirst node

Doubly linked listNodes point next and previous

CycleList loops back on itself