Java Team Scheduling Algorithm

Discussion in 'Java' started by dlemmermann, Mar 12, 2007.

  1. dlemmermann

    dlemmermann Guest

    Hi there,

    does anyone know of an open-source algorithm for "Team Scheduling"? I
    want to
    create a little demo of a Swing framework that I developed. In this
    demo I want to
    simulate a soccer / football league where 18 teams play against each
    other. The
    matches take place on a total of 34 weekends. Each team plays each
    other team
    twice, once at home, once away.

    At first I thought this could be solved easily with two nested "for"
    loops but it turns
    out to be more complicated than that. Especially placing the matches
    onto those
    34 days without any team playing twice on the same day.

    If anyone knows of a solution for this scenario, please let me know. I
    tried solving
    this myself but ended up with a couple of nods in my brain.



    P.S.: no, I am not a student who needs help with his homework.
    Unfortunately I
    am too old for that (38 this weekend :-( ) To confirm look at
    dlemmermann, Mar 12, 2007
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  2. dlemmermann

    Daniel Dyer Guest

    The problem can be slightly simplified if you ignore the home/away
    requirement. The second part of the season can be the same as the first
    part but with the teams switched.

    This leaves you with 17 dates on each of which there must be 9 fixtures,
    with each team playing once on each date.

    Firstly generate all of the required matches for the season (ignoring who
    is at home). This is the set of all combinations of length 2 from a set
    of 18 elements.

    This will give you 153 pairs of teams that you need to divide into 17
    separate pots ensuring that each team only appears once in each pot.

    I'm not sure of the best way to do this, but I think the following
    approach should work reasonably well (although somebody else can probably
    suggest a more efficient way of doint it):

    Firstly shuffle the list of 153 pairs (assuming you don't want the
    fixtures to be predictable). Then take each pair in turn and allocate it
    to the first available pot (fixture date) in which neither team is already
    present. I haven't tried it, but I think this should give you what you

    Once you've done this you can just duplicate the fixtures for the second
    half of the season, switching the home and away teams for each match.

    Daniel Dyer, Mar 12, 2007
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