获取比赛排行榜

{
    "users": [
        {
            "id": 0,
            "username": "string",
            "real_name": "string",
            "problems": [
                {
                    "name": "string",
                    "status": 0,
                    "score": 0,
                    "time": "string",
                    "submission_id": 0,
                    "id": 0
                }
            ],
            "score": 0
        }
    ],
    "time": "string"
}