PHPGangsta Algorithmus-Wettbewerb Teil 2: Spielplan errechnen

<?php
$time = microtime(true);

// codeteil start
function battle($numPlayers = 20)
{
    for($x = 1; $x <= $numPlayers; $x++)
        $listPlayers[] = $x;
    shuffle($listPlayers);

    $listRounds = array();
    $numPlayersHalf = $numPlayers * 0.5;
    $count = 0;
    for($round = 1; $round <= $numPlayersHalf; $round++) {
        for($x = $count; $x < $numPlayersHalf; $x++) {
            $listRounds[$round][] = array($listPlayers[$x], null);
        }
        for($x = 0; $x < $count; $x++) {
            $listRounds[$round][] = array($listPlayers[$x], null);
        }
        $a = 0;
        for($x = $numPlayersHalf + $count; $x < $numPlayers; $x++) {
            $listRounds[$round][$a++][1] = $listPlayers[$x];
        }
        $a = $numPlayersHalf - $count;
        for($x = $numPlayersHalf; $x < $numPlayersHalf + $count; $x++) {
            $listRounds[$round][$a++][1] = $listPlayers[$x];
        }
        $count++;
    }
    return $listRounds;
}

$listRounds = battle(20);
// codeteil ende

echo '<table border="1">';
echo '<tr>';
echo '<td></td>';
for($x = 0; $x < $numPlayers * 0.5; $x++) {
    echo '<td><strong>Spielbrett ' . $x . '</strong></td>';
}
echo '</tr>';
foreach($listRounds AS $round => $fields) {
    echo '<tr>';
    echo '<td><strong>Runde ' . $round . '</strong></td>';
    foreach($fields AS $players) {
        echo '<td>Spieler ' . $players[0] . ' vs. Spieler ' . $players[1] . '</td>';
    }
    echo '</tr>';
}
echo '</table>';
echo '<p style="text-align: center;">' . (microtime(true) - $time) . ' Sek.</p>';