I have the following Java Code that implements a max heap. It runs correctly,
List of numbers:
4, 1, 3, 2, 16, 9, 10, 14, 8, 7
MaxHeap result:
16 14 10 8 7 9 3 2 4 1
What I would like, is a change this code so as by giving an Index to make a Max-Heap only a part of the array.
For example if i give index=4
it should not affect the 4 first elements : 4 1 3 2
but to make a max heap with the remaining elements 16, 9 ,10, 14, 8, 7
So the final result shouuld be
4 1 3 2 16 14 10 9 8 7
Not other array should be used but only the given one:
public class Heapify {
public static int[] Arr = {
4, 1, 3, 2, 16, 9, 10, 14, 8, 7
};
public static int counter = 0;
public static void main(String[] args) {
heapMe();
for (int krk = 0; krk < Arr.length; krk++) {
System.out.println(Arr[krk]);
}
}
public static void heapMe() {
int kk;
for (kk = (Arr.length) / 2 - 1; kk >= 0; kk--) {
heapify(Arr, kk);
}
}
public static void heapify(int[] Arr, int i) {
int largest;
int left = 2 * i + 1;
int right = 2 * i + 2;
if (((left < Arr.length) && (Arr[left] > Arr[i]))) {
largest = left;
} else {
largest = i;
}
if (((right < Arr.length) && (Arr[right] > Arr[largest]))) {
largest = right;
}
if (largest != i) {
swap(i, largest);
heapify(Arr, largest);
}
}
private static void swap(int i, int largest) {
int t = Arr[i];
Arr[i] = Arr[largest];
Arr[largest] = t;
}
}