python实现OJ系统比赛板块

实现OJ系统比赛板块需要涉及到以下几个方面：

用户管理：包括用户注册、登录、修改个人信息等功能。
题目管理：包括题目的添加、修改、删除、查询等功能。
比赛管理：包括比赛的创建、修改、删除、查询等功能。
答题记录管理：包括记录用户的答题情况、成绩统计、排名等功能。

下面是一个简单的Python实现OJ系统比赛板块的示例代码：

import datetime

class User:
    def __init__(self, username, password, email):
        self.username = username
        self.password = password
        self.email = email

class Problem:
    def __init__(self, problem_id, title, description, input_desc, output_desc, sample_input, sample_output):
        self.problem_id = problem_id
        self.title = title
        self.description = description
        self.input_desc = input_desc
        self.output_desc = output_desc
        self.sample_input = sample_input
        self.sample_output = sample_output

class Contest:
    def __init__(self, contest_id, title, start_time, end_time, problems):
        self.contest_id = contest_id
        self.title = title
        self.start_time = start_time
        self.end_time = end_time
        self.problems = problems

class Submission:
    def __init__(self, user, problem, contest, code, result, submit_time):
        self.user = user
        self.problem = problem
        self.contest = contest
        self.code = code
        self.result = result
        self.submit_time = submit_time

class OJSystem:
    def __init__(self):
        self.users = []
        self.problems = []
        self.contests = []
        self.submissions = []

    def register_user(self, username, password, email):
        user = User(username, password, email)
        self.users.append(user)

    def login(self, username, password):
        for user in self.users:
            if user.username == username and user.password == password:
                return user
        return None

    def add_problem(self, problem_id, title, description, input_desc, output_desc, sample_input, sample_output):
        problem = Problem(problem_id, title, description, input_desc, output_desc, sample_input, sample_output)
        self.problems.append(problem)

    def create_contest(self, contest_id, title, start_time, end_time, problems):
        contest = Contest(contest_id, title, start_time, end_time, problems)
        self.contests.append(contest)

    def submit_solution(self, user, problem, contest, code):
        result = self.run_code(code) # 运行代码，得到结果
        submit_time = datetime.datetime.now()
        submission = Submission(user, problem, contest, code, result, submit_time)
        self.submissions.append(submission)

    def run_code(self, code):
        # 运行代码，返回结果
        pass

    def get_user_submissions(self, user):
        user_submissions = []
        for submission in self.submissions:
            if submission.user == user:
                user_submissions.append(submission)
        return user_submissions

    def get_contest_ranklist(self, contest):
        ranklist = []
        for user in self.users:
            user_submissions = []
            for submission in self.submissions:
                if submission.user == user and submission.contest == contest:
                    user_submissions.append(submission)
            if len(user_submissions) > 0:
                total_time = 0
                total_penalty = 0
                solved_problems = set()
                for submission in user_submissions:
                    if submission.result == 'Accepted':
                        solved_problems.add(submission.problem)
                        total_time += (submission.submit_time - contest.start_time).total_seconds() / 60
                        total_time += total_penalty * 20
                    else:
                        total_penalty += 1
                ranklist.append((user, len(solved_problems), total_time))
        ranklist.sort(key=lambda x: (-x[1], x[2]))
        return ranklist

以上代码实现了一个简单的OJ系统，包括了用户管理、题目管理、比赛管理、答题记录管理等功能。其中，用户、题目、比赛、提交记录分别对应了User、Problem、Contest、Submission类，OJ系统则通过OJSystem类来管理这些对象。

在OJSystem类中，我们实现了如下几个方法：

register_user：用户注册方法，将新用户添加到用户列表中。
login：用户登录方法，根据用户名和密码查找用户对象。
add_problem：添加题目方法，将新题目添加到题目列表中。
create_contest：创建比赛方法，将新比赛添加到比赛列表中。
submit_solution：提交答案方法，将新提交记录添加到提交记录列表中，并调用run_code方法运行代码并得到结果。
run_code：运行代码方法，这里我们暂时只是一个空方法，需要根据具体需求来实现。
get_user_submissions：获取用户提交记录方法，根据用户对象查找其提交记录。
get_contest_ranklist：获取比赛排名方法，根据比赛对象计算每个用户的得分，然后按照得分排序