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What is the time complexity for inserting/deleting at the beginning of the array?

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What is the time complexity for inserting/deleting at the beginning of the array?

(a) O(1)

(b) O(n)

(c) O(logn)

(d) O(nlogn)

Question is from Dynamic Array in section Arrays Types of Data Structures & Algorithms I

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Correct option is (b) O(n)

Easiest explanation - All the other elements will have to be moved, hence O(n).

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