using System;

public class Program

{

    public static void Main(string[] args)

    {

        var numberTeams = 16;   // must be a power of 2

        var limit = (int) (Math.Log(numberTeams, 2) + 1);

        for (int round = 1; round < limit; round++) {

            Console.WriteLine("Round #{0}", round);

            branch(1, 1, limit - round + 1);

            Console.WriteLine();

        }

    }

    public static void branch(int seed, int level, int limit) {

        var levelSum = (int) Math.Pow(2, level) + 1;

        if (limit == level + 1) {

            Console.WriteLine("Seed {0} vs. Seed {1}", seed, levelSum - seed);

            return;

        }

        else if (seed % 2 == 1) {

            branch(seed, level + 1, limit);

            branch(levelSum - seed, level + 1, limit);

        }

        else {

            branch(levelSum - seed, level + 1, limit);

            branch(seed, level + 1, limit);

        }

    }

}