题解 | #交换变量值#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        int b = scanner.nextInt();

        a = a+b-(b=a);
        // 先执行b=a 把a的值赋给b
        // 再执行a = a+b-(b=a)即a+b-a=b 把初始b赋给a
        

        System.out.println(a+" "+b);
    }
}