ZOJ-2388

有个坑，由于分数是非负整数，所以sum和diff同为奇或同为偶，为此WA了一次

import java.util.Scanner;public class Main{public static void main(String[] args){Scanner sc = new Scanner(System.in);int n = sc.nextInt();for (int i = 0; i < n; i++){int sum = sc.nextInt();int diff = sc.nextInt();if (diff > sum)System.out.println("impossible");else if ((sum + diff) % 2 != 0)System.out.println("impossible");elseSystem.out.format("%d %d\n", (sum + diff) / 2, (sum - diff) / 2);}}}