## Answers

When does quicksort's worst-case run-time behavior occur?

1. when the data is randomly initialized in the array.

2. when the data is in ascending order.

3. when the data is in descending order.

**Answer:- 2 and 3 only (Option number 4)**

**Explanation:-** When array is sorted in either ascending and descending order

then the leftmost and rightmost element is pivot for quicksort

It breaks the array into 1 and N-1 recursively which causes the

complexity of quick sort becomes **O(n ^{2})** instead of average case

complexity of

**O(nlogn).**

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