Why is insertion faster in a linked list than in an array?#datastructures #Algorithms#Coding

This is a basic but tricky DSA interview question.
Why is insertion faster in a linked list than in an array?

1️⃣ Array needs shifting
When you insert an element in the middle of an array,
all elements after that position must shift.
Example:
Insert at index 2 → elements move right.
Time complexity: O(n)

2️⃣ Linked list only updates pointers
In a linked list, you just change the next pointer.
Example:
A → B → C
Insert D after B
A → B → D → C
No shifting required.
Time complexity: O(1) (if position known)

3️⃣ Memory layout difference
Arrays store elements in contiguous memory.
Linked lists store elements scattered in memory with pointers.

🎯 Interview takeaway

Array insertion → move many elements
Linked list insertion → update pointers

Pointer change is cheaper than shifting data.

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