题解 | 构造C的歪

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 scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        int b = scanner.nextInt();
        if (a>b){
            int c=b-(a-b);
            System.out.println(c);
        }else {
            int c=a-(b-a);
            System.out.println(c);
        }
    }
}