瑞士轮算法phpd实例

以下是一个简单的使用PHP实现瑞士轮算法的示例:

<?php
// 参赛者列表，每个参赛者都有一个唯一的ID
$players = array(
    "player1",
    "player2",
    "player3",
    "player4",
    "player5",
    "player6"
);

// 记录每个参赛者在每个轮次的胜负情况
$results = array(
    "player1" => array(),
    "player2" => array(),
    "player3" => array(),
    "player4" => array(),
    "player5" => array(),
    "player6" => array()
);

// 进行固定轮次的比赛
for ($round = 1; $round <= 3; $round++) {
    // 随机打乱参赛者顺序
    shuffle($players);
    // 分配对手
    $matches = array();
    for ($i = 0; $i < count($players); $i += 2) {
        $matches[] = array($players[$i], $players[$i+1]);
    }
    // 进行比赛
    foreach ($matches as $match) {
        // 生成随机结果，1表示胜利，0表示失败
        $result1 = rand(0,1);
        $result2 = 1 - $result1;
        // 记录结果
        $results[$match[0]][$round] = $result1;
        $results[$match[1]][$round] = $result2;
    }
}

// 计算每个参赛者的总胜场数和对手的总胜场数
$scores = array();
foreach ($players as $player) {
    $wins = 0;
    $opponentWins = 0;
    foreach ($results[$player] as $result) {
        if ($result == 1) {
            $wins++;
        }
    }
    foreach ($players as $opponent) {
        if ($opponent != $player) {
            foreach ($results[$opponent] as $result) {
                if ($result == 1 && in_array($opponent, $matches)) {
                    $opponentWins++;
                }
            }
        }
    }
    $scores[$player] = array(
        "wins" => $wins,
        "opponentWins" => $opponentWins
    );
}

// 排序参赛者列表，按照胜场数和对手胜场数之和排序
uasort($scores, function ($a, $b) {
    $aScore = $a["wins"] + $a["opponentWins"];
    $bScore = $b["wins"] + $b["opponentWins"];
    if ($aScore == $bScore) {
        return $a["wins"] < $b["wins"];
    }
    return $aScore < $bScore;
});

// 打印排名结果
echo "排名结果：\n";
$rank = 1;
foreach ($scores as $player => $score) {
    echo "$rank. $player (胜场数: {$score["wins"]}, 对手胜场数: {$score["opponentWins"]})\n";
    $rank++;
}
?>

这个示例中，我们模拟了一个6人参赛的比赛，每个人参加3轮比赛，每轮比赛两两配对。我们通过随机结果来模拟比赛，然后根据每个人的胜负情况和对手的胜负情况来计算每个人的排名。最终，我们按照胜场数和对手胜场数之和来排序，输出排名结果。