public int getSubHeap(int index,V[] vec){
        if(index>this.size()){
            return -1;
        }

        int i=0;
        LinkedList<Integer> qIndices=new LinkedList<>();
        qIndices.add(index);
        vec[i]=heap.get(index).getValue();
        while(!qIndices.isEmpty()){
            index=qIndices.remove();
            if(hasLeft(index)){
                i=i+1;
                vec[i]=heap.get(left(index)).getValue();
                qIndices.add(left(index));
            }
            if(hasRight(index)){
                i=i+1;
                vec[i]=heap.get(right(index)).getValue();
                qIndices.add(right(index));
            }
        }
        return i+1;
    }