GATE | GATE CS 1996 | Question 36

The minimum number of interchanges needed to convert the array 89, 19, 40, 17, 12, 10, 2, 5, 7, 11, 6, 9, 70 into a heap with the maximum element at the root is
(A) 0
(B) 1
(C) 2
(D) 3


Answer: (C)

Explanation: In these kind of questions we have to make the structure of heap and then try to apply heapify operation in a bottom up fashion and counting number of swaps done in the above question 70 will go up the heap structure 2 times.

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