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BeginnerSample question
What is a linked list and when should I use it?
A linked list is a linear data structure where each element (a node) holds a value and a pointer to the next node.
Use one when:
- You need O(1) insertion/deletion at the head
- The size changes a lot at runtime
- You don't need random access by index
Avoid it when you need fast indexed lookup — an array is better there.