UVA 10812 Java

import java.util.*;

public class main{
  public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
   	int cases = sc.nextInt();
   	for(int i = 0; i < cases; i++)
   	{
   		int num1 = sc.nextInt();
   		int num2 = sc.nextInt();
   		int sum = num1 + num2;
   		int dif = num1 - num2;
   		if(sum < 0 || dif < 0 || sum % 2 != 0 && dif % 2 != 0)
   			System.out.println("impossible");
   		else
   			System.out.printf("%d %d\r\n", sum / 2, dif / 2);
   	}
  }
};