[백준] 4299번 : AFC 윔블던 - C#

https://www.acmicpc.net/problem/4299

using static System.Console;

class Program
{
    static void Main() {
        string[] s=ReadLine().Split(" ");
        int a=int.Parse(s[0]);
        int b=int.Parse(s[1]);
        if((a+b)%2==1||a<b) Write(-1);
        else{
            int n=(a+b)/2;
            int m=a-n;
            Write("{0} {1}",n,m);
        }
    }
}