Algorithms | Sorting | Question 7

Which of the following is not true about comparison based sorting algorithms?
(A) The minimum possible time complexity of a comparison based sorting algorithm is O(nLogn) for a random input array
(B) Any comparison based sorting algorithm can be made stable by using position as a criteria when two elements are compared
(C) Counting Sort is not a comparison based sorting algortihm
(D) Heap Sort is not a comparison based sorting algorithm.


Answer: (D)

Explanation: See https://www.geeksforgeeks.org/lower-bound-on-comparison-based-sorting-algorithms/ for point A. See https://www.geeksforgeeks.org/stability-in-sorting-algorithms/ for B. C is true, count sort is an Integer Sorting algorithm.

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