$5-($Chapter $10,$ Question $12)$ Consider the following array:

$47,78,81,52,50,82,58,42,65,80,92,53,63,87,95,59,34,37,7,20$

a$.$ Using the function buildHeap as given in this chapter, convert the array into a heap. Show

the final form of the array.

b$.$ Using mergeSort, sort the array by showing the steps.