Question: The quicksort algorithm is used to sort an input sequence of n integers where each integer is either 1 , or 2 , or 3

The quicksort algorithm is used to sort an input sequence of n integers where each integer is either 1, or 2, or 3. For this input sequence, the tight bound on the worst case time complexity for executing quicksort is:
O(n log n)
O(n2)
O(log n)
O(n)

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