Question 1

How do you find the kth largest element in an array using a heap?

Accepted Answer

You can find the kth largest element in an array by using a min-heap of size k. Iterate through the array, and for each element, if the heap has less than k elements, add the element to the heap. Otherwise, if the element is larger than the smallest element in the heap, remove the smallest element and add the new element.

Question 2

What is the time complexity of building a heap from an array?

Accepted Answer

The time complexity of building a heap from an array of n elements is O(n). This is because the heapify operation is performed on each non-leaf node, and the total work done is proportional to n.

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