j

import java.util.*;
public class League
{
    public static void ListMatches(List TeamList)
    {
        int num_of_teams = 12;
        int num_of_days = num_of_teams-1;
        int half_size_of_team = num_of_teams/2;

        List teams = new ArrayList();
        List matches = new ArrayList();
        List derbymatches = new ArrayList();

        teams.addAll(TeamList);
        teams.remove(0);

        int teamSize = teams.size();

        for(int day = 0; day < num_of_days; day++)
        {
            System.out.println("Day {0} " + (day + 1));
            int teamIdx = day % teamSize;

            //for the first team in each day, match it with team 1
            matches.add(teams.get(teamIdx)+"/"+TeamList.get(0));

            for(int i=1; i < half_size_of_team; i++)
            {
                    int firstTeam = (day + 1) % teamSize;
                    int secondTeam = (day + teamSize - i) % teamSize;
                    matches.add(teams.get(firstTeam)+"/"+teams.get(secondTeam));
            }
        }
       for(int i =0; i<matches.size(); i++)
       {
            String temp = matches.get(i).toString();
            if(isLastMatchDerby(temp) && isMatchDerby(temp))
            {
                System.out.println("This match " + temp + "is a derby");
                derbymatches.add(temp);
                continue;
            }
            else
            {
                System.out.println(temp);
            }
        }
       if(derbymatches.size() > 0)
       {
           System.out.println("I still have items left...");
          for(int i = 0; i<derbymatches.size(); i++)
          {
              String temp = derbymatches.get(i).toString();
              System.out.println(temp);
          }
       }
    }
    public static void main(String[] args)
    {
        List TeamList = new ArrayList();
        TeamList.add("Team A");TeamList.add("Team B");TeamList.add("Team C");TeamList.add("Team D");
        TeamList.add("Team E");TeamList.add("Team F");TeamList.add("Team G");TeamList.add("Team H");
        TeamList.add("Team I");TeamList.add("Team K");TeamList.add("Team L");TeamList.add("Team M");
        ListMatches(TeamList);
    }

    public static boolean isLastMatchDerby(String par)
    {
        String pars[] = par.split("/");
        String a = pars[0];
        String b = pars[1];

        if(a == "Team A" && b == "Team G")
            return true;
        if(a == "Team G" && b == "Team A")
            return true;
        if(a == "Team C" && b == "Team D")
            return true;
        if(a == "Team D" && b == "Team C")
            return true;
        if(a == "Team C" && b == "Team E")
            return true;
        if(a == "Team E" && b == "Team C")
            return true;
        if(a == "Team D" && b == "Team E")
            return true;
        if(a == "Team E" && b == "Team D")
            return true;

        return false;
    }
     public static boolean isMatchDerby(String par)
    {
        String pars[] = par.split("/");
        String a = pars[0];
        String b = pars[1];

        if(a == "Team A" && b == "Team G")
            return true;
        if(a == "Team G" && b == "Team A")
            return true;
        if(a == "Team C" && b == "Team D")
            return true;
        if(a == "Team D" && b == "Team C")
            return true;
        if(a == "Team C" && b == "Team E")
            return true;
        if(a == "Team E" && b == "Team C")
            return true;
        if(a == "Team D" && b == "Team E")
            return true;
        if(a == "Team E" && b == "Team D")
            return true;

        return false;
    }
}