# What is the time complexity of quick sort when all the values of input array are equal?

## What is the time complexity of quick sort when all the values of input array are equal?

By using the Hoare partition algorithm we get the best case with all the array elements equal. The time complexity is O(n).

## What happens in the Quicksort algorithm if the items are already sorted?

The performance of quicksort is in order of nlogn for most of the cases. If the list of elements is already in sorted order or nearly sorted order then it takes n² comparisons to sort the array. Yes, there are cases where Quicksort performs badly.

READ ALSO:   What type of climate does British Columbia have?

What will be the complexity if quick sort is applied on the given data set?

Space Complexity of Quick sort The worst case space used will be O(n) . The average case space used will be of the order O(log n) . The worst case space complexity becomes O(n) , when the algorithm encounters its worst case where for getting a sorted list, we need to make n recursive calls.

### What happens if all keys are equal in case of quick sort?

The running time of QUICKSORT when all elements of array A have the same value will be equivalent to the worst case running of QUICKSORT since no matter what pivot is picked, QUICKSORT will have to go through all the values in A.

### What is the time complexity of QuickSort?

To sort an array of n distinct elements, quicksort takes O(n log n) time in expectation, averaged over all n! permutations of n elements with equal probability.

READ ALSO:   Is it too hot to wear leather pants in summer?

What is the complexity of QuickSort?

Although the worst case time complexity of QuickSort is O(n2) which is more than many other sorting algorithms like Merge Sort and Heap Sort, QuickSort is faster in practice, because its inner loop can be efficiently implemented on most architectures, and in most real-world data.

## What is the complexity of quick sort?

What is the complexity of QuickSort in best case?

n*log(n)
Quicksort/Best complexity

### What is the time complexity of selection sort?

In computer science, selection sort is an in-place comparison sorting algorithm. It has an O(n2) time complexity, which makes it inefficient on large lists, and generally performs worse than the similar insertion sort.