ALGORITHM Quicksort(A[l..r]) //Sorts a subarray by quicksort //Input: Subarray of array A[0..n − 1], defined by its left and right // indices l and r //Output: Subarray A[l..r] sorted in nondecreasing order   if l < r     s = Partition(A[l..r]) //s is a split position     Quicksort(A[l..s − 1])     Quicksort(A[s + 1..r]) The above code is the quicksort algorithm. Perform a time complexity analysis for quicksort. You need to explain 1) what makes a worst case, what makes a best case, 2) the time complexity for both the worst case and the best case, 3) how to avoid the worst case in practice.

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