/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static int binarySearch(int[] arr, int target) {
        int left = 0, right = arr.length - 1;
        while (left <= right) {
            int mid = (left + right) / 2;
            System.out.println("MID: " + mid);
            if (arr[mid] == target) return mid;
            else if (arr[mid] < target) left = mid + 1;
            else right = mid - 1;
        }
        return -1;
    }
 
 
	public static void main (String[] args) throws java.lang.Exception
	{
        // Test
        int[] arr = {1, 3, 5, 7, 9};
        int target = 9;
        int result = binarySearch(arr, target);
        System.out.println(result);
	}
}

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