题解 | #交换变量值#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        a = a + b;
        b = a - b;
        a = a - b;
        System.out.print(a + " " + b);
    }
}