鸡兔筒笼，砍脚法

鸡兔筒笼，砍脚法

Scanner in=new Scanner(System.in);
    	int a=in.nextInt();
    	int b=in.nextInt();
    	int c=0;
    	if (b%2==0&&a<=(b/2)){
           	c=a*2;
           	b-=c;
           	b/=2;
           	a-=b;
           	System.out.println(a+" "+b);
		}
    	else {
			System.out.println("No answer");
		}
    }