## Amazon Interview Question for SDE1s

Country: United States
Interview Type: In-Person

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3
of 3 vote

The porblem can be solved by implementing maxHeap for comparable objects. The sample code for heap of the fixed size is shown below:

``````public class MaxHeap<E extends Comparable>{
privete int N, size;
private E[] heap;

public MaxHeap(int maxSize) {
this.size = 0;
this.N = maxSize;
this.heap = (E[]) new Object[N+1];
Arrays.fill(this.heap, null);
}

public void add(E item) {
if (size == N)	throw new IndexOutOfBoundsException("Heap is full");
heap[++size] = item;
swim(size);
}

public E remove() {
if (size == 0)	throw new IndexOutOfBoundsException("Heap is empty");
E item = heap[1];
heap[1] = heap[size]; 	// replace 1st with last
heap[size--] = null; 		// decrement size, avoid loitering
sink(1);				// sink replaced item
return item;
}

public int size() { return this.size}
public boolean isEmpty() {return this.size == 0}

private void sink(int i) {
while (2*i < size) {
int j = 2*i;
if (j <= size && less(j, j+1)) 	j++;
if ( less(i, j) ) 		swap(i, j);
else 				break;
i = j;
}
}
private void swim(int i) {
while (i > 1 && less(i/2, i)) {
swap(i, i/2);
i /= 2;
}
}
private boolean less (int i, int j) { return heap[i].compareTo(heap[j]) < 0; }

private void swap(int i, int j) {
E aux = heap[i];
heap[i] = heap[j];
heap[j] = aux;
}
}``````

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