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What is the time complexity of insert function in a hash table using list head?

(a) O(1)

(b) O(n)

(c) O(log n)

(d) O(n log n)

The above asked question is from Hash Tables topic in division Hash Tables of Data Structures & Algorithms I

The question was posed to me during an interview for a job.

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Correct answer is (a) O(1)

The best I can explain: Time complexity of insert function in a hash table is O(1). Condition is that the number of collisions should be low.

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