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import java.util.Arrays;

public class Main {

public static void main(String[] args) {

int[] arr={1,2,3,4,5,6,7};

int index1=Binary(arr, 12, 0, arr.length - 1);

int index2=Binary(arr, 66, 0, arr.length - 1);

System.out.println(index1);

System.out.println(index2);

}

public static int Binary(int[] arr, int key, int low, int high) {

while (low <= high) {

int mid=(low+high)/2;

if(arr[mid]>key){

high = mid - 1;

}

else if(arr[mid] < key){

low = mid + 1;

}

else{

return mid;

}

}

return -1;

}

}