Binary search in Java Searching in a descending sorted array

The method described in the theory performs binary search for arrays sorted in ascending order. Your task here is to modify the method such that:

• it allows searching in descending sorted arrays;
• it returns the first index of a target element from the beginning of the array (the leftmost index).

Sample Input 1:

15
17 17 16 15 15 15 15 14 14

Sample Output 1:

3

Sample Input 2:

2
3 3 3 3 3 1 1 1 0

Sample Output 2:

-1

Sample Input 3:

22
40 31 22 22 22 22 22 22

Sample Output 3:

2

import java.util.ArrayList;
import java.util.Scanner;

public class Main {

    /* Modify this method */
    public static int binarySearch(int elem, int[] array) {

        int left = -1;
        int right = array.length;

        while (left < right - 1) {
            int mid = left + (right - left) / 2;
            if (array[mid] > elem) {
                left = mid;
            } else {
                right = mid;
            }
        }
        if (array[right] == elem) {
            return right;
        } else {
            return -1;
        }
    }

    /* Do not change code below */
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int elem = scanner.nextInt();
        ArrayList<Integer> list = new ArrayList<>();
        while (scanner.hasNextInt()) {
            list.add(scanner.nextInt());
        }
        int[] array = new int[list.size()];
        for (int i = 0; i < array.length; i++) {
            array[i] = list.get(i);
        }
        System.out.println(binarySearch(elem, array));
    }
}