If a hashing function runs in constant time, insertions, accesses, and removals of the associated keys are O(1).

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Quizplus · Accepted Answer

If a hashing function runs in constant time, it means that each of the operations (insertions, accesses, and removals) take the same amount of time regardless of the size of the hash table or the number of keys that it contains. This is the basis for the O(1) complexity of these operations.

If a Hashing Function Runs in Constant Time, Insertions, Accesses