Introsort Multiple choice Questions and Answers (MCQs)

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Introsort Multiple choice Questions and Answers (MCQs)

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Question 11 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
Why is heap sort preferred over merge sort for introsort implementation?
A
Because heap sort is faster
B
Because heap sort requires less space
C
Because heap sort is easy to implement
D
Because heap sort is easy to understand
Question 11 Explanation: 
Both heap sort and merge sort have the same time complexity. But heap sort is an in-place sorting algorithm whereas merge sort requires O(n) auxiliary space which makes heap sort a more preferable option.

Question 12 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
Why is insertion sort preferred over other sorting algorithms (like selection sort, bubble sort etc.) for introsort implementation?
A
Because insertion sort is faster and adaptive
B
Because insertion sort requires less space
C
Because insertion sort is easy to implement
D
Because insertion sort is easy to understand
Question 12 Explanation: 
When small arrays need to be sorted then insertion sort proves to be the best choice . Also it is adaptive so it performs better than others when the given array is fully/partially sorted.

Question 13 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
What is the cut-off for switching from quick sort to insertion sort in the implementation of introsort?
A
4
B
8
C
16
D
32
Question 13 Explanation: 
When small arrays needs to be sorted then insertion sort proves to be the best choice . So when the size of the partition is less than 16 introsort switches to insertion sort. This particular value has been deduced experimentally.

Question 14 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
What is the cut-off for switching from quick sort to heap sort in the implementation of introsort?
A
16
B
n2
C
n log(n)
D
2 log (n)
Question 14 Explanation: 
Quicksort has a worst case time complexity of O(n2) which is not preferable. So in order to avoid worst case of quicksort, introsort switches to heap sort when the depth is greater than 2 log(n). This particular value has been deduced experimentally.

Question 15 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
Which of the following sorting algorithm will be preferred when the size of partition is between 16 and 2 log(n) while implementing introsort?
A
quick sort
B
insertion sort
C
heap sort
D
merge sort
Question 15 Explanation: 
Quicksort proves to be the best sorting algorithm for mid sized arrays as it has low space and time complexity. Thus quick sort is preferred when size of partition is between 16 and 2 log(n).

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