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

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

(a) O(1)

(b) O(n)

(c) O(log n)

(d) O(n log n)

I'm obligated to ask this question of Hash Tables in division Hash Tables of Data Structures & Algorithms I

The question was posed to me during a job interview.

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Correct answer is (a) O(1)

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

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