[SPOILER] My solution to the tournament scheduler quiz

I just coded up the algorithm given at
http://www.gamecabinet.com/rules/RoundRobinScheme.html

Walt

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#!/usr/local/bin/perl -w
use strict;

my $sched = allocate_schedule($ARGV[0]);
print_sched($sched);

sub allocate_schedule {
    my $n = shift;
    $n++ if $n % 2;  # add ghost player

    my @teams = (0..$n-1);
    my @sched;
    for (1..$n-1) {
        my @round;
        for my $j (0..$n-1) {
            $round[$teams[$j]] = $teams[-($j+1)];
        }
        push @sched, \@round;
        unshift @teams, splice @teams, -2, 1;
    }
    return \@sched;
}

sub print_sched {
    my $sched = shift;

    my $out = "[";
    for my $round (@$sched) {
        $out .= "[" . join(",", @$round) . '],';
    }
    chop $out; # remove final ,
    $out .= "]";
    print "$out\n";
}

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