Implementing Quicksort

The video tutorial explains the implementation of the Quicksort algorithm. It begins with setting up the main function and defining a helper function to handle recursive calls. The tutorial covers the base cases for recursion, selecting a pivot, and managing pointers. It also explains the logic for swapping elements and making recursive calls to sort subarrays. Finally, the video concludes with the final steps to return the sorted array.

What is the primary input type for the Quicksort function?

• Integer

• Dictionary

• Array or List

• String

Why is a helper function used in the Quicksort algorithm?

• To manage recursive calls efficiently

• To convert the array into a list

• To handle input validation

• To sort the array in descending order

What is the base case for the recursive Quicksort function?

• When the array is empty

• When the pivot is at the end of the array

• When start and end pointers are equal or start is greater than end

• When the array is sorted

How is the pivot initially selected in the Quicksort algorithm?

• As the middle element of the array

• As the last element of the array

• As the first element of the array

• As a random element of the array

What condition is checked in the while loop during the Quicksort process?

• If left is greater than right

• If right is greater than or equal to left

• If the array is sorted

• If the pivot is at the correct position

What happens when both conditions in the while loop are true?

• The pivot is moved to the end

• The left and right elements are swapped

• The array is split into two

• The recursion stops

What is the purpose of swapping the pivot with the right pointer?

• To sort the entire array

• To find the median of the array

• To place the pivot in its correct position

• To reverse the array

What is the next step after the pivot is placed in its correct position?

• The array is reversed

• Recursive calls are made for the left and right subarrays

• The array is printed

• The function returns the sorted array

How does the algorithm handle arrays with only one element?

• It ignores them

• It merges them with other arrays

• It returns them as they are already sorted

• It sorts them separately

What is the significance of the start and end pointers being equal?

• It indicates the array is unsorted

• It shows the pivot is misplaced

• It means the array is empty

• It signifies a single element which is already sorted