完整实现邮件发送

初版
52 changed files with 8151 additions and 1235 deletions
--- a/README.md
+++ b/README.md
@ -1,258 +1,2 @@
 # eaxmSystem

-# 数学学习考试系统
-
-## 项目简介
-
-一个基于C++和Qt框架开发的跨平台数学学习考试系统，支持小学、初中、高中三个学段的数学题目生成、在线答题、成绩统计等功能。系统采用前后端分离架构。
-
-## 功能特性
-
-### 🔐 用户管理
-
- 用户注册（邮箱验证码验证）
- 用户登录/登出
- 密码修改
- 个人信息查看
-
-### 📚 题目生成
- **小学**：基础四则运算，确保结果非负
- **初中**：包含平方、开根号运算
- **高中**：包含三角函数运算
- 智能查重，避免重复题目
- 历史题目保存和加载
-
-### 🎯 考试功能
- 自定义题目数量（5-50题）
- 实时答题进度显示
- 上一题/下一题导航
- 自动批改和成绩统计
- 错题回顾
-
-### 💾 数据管理
-
- 用户数据持久化存储
- 题目历史记录保存
- 自动备份和恢复
-
-## 技术栈
-
-### 前端
- **框架**：Qt 5/6
- **语言**：C++
- **UI组件**：QWidget、QStackedWidget、QPushButton等
-
-### 后端
-
- **核心架构**：模块化设计，工厂模式
- **数学计算**：表达式解析和求值
- **文件管理**：CSV格式用户数据，TXT格式题目存储
- **邮件服务**：libcurl + SMTP协议
-
-### 开发工具
-
- **编译器**：支持C++11的编译器（gcc/clang/MSVC）
- **构建工具**：CMake
- **版本控制**：Git
-
-## 项目结构
-
-```
-MathExamSystem/
-├── frontend/                  # 前端界面
-│   ├── base_widget.h/.cc     # 基础窗口组件
-│   ├── login_widget.h/.cc    # 登录注册界面
-│   ├── selection_widget.h/.cc # 难度选择界面
-│   ├── question_widget.h/.cc # 答题界面
-│   ├── result_widget.h/.cc   # 成绩显示界面
-│   ├── main_window.h/.cc     # 主窗口管理
-│   └── change_password_dialog.h/.cc # 修改密码对话框
-├── backend/                   # 后端核心
-│   ├── exam_system/          # 考试系统核心
-│   │   ├── exam_system.h/.cc # 系统控制层
-│   │   ├── problem_generator.h/.cc # 题目生成器
-│   │   ├── duplicate_checker.h/.cc # 重复检查器
-│   │   └── input_validator.h/.cc   # 输入验证器
-│   ├── file_manager/         # 文件管理
-│   │   └── file_manager.h/.cc
-│   └── logger/               # 日志系统
-│       └── logger.h/.cc
-├── shared/                   # 共享接口
-│   └── backend_interface.h/.cc # 前后端通信接口
-├── main.cc                   # 程序入口
-└── CMakeLists.txt           # 构建配置
-```
-
-
-
-## 环境要求
-
-### 系统要求
- **Windows**: Windows 10/11, Visual Studio 2019+
- **Linux**: Ubuntu 18.04+, CentOS 7+
- **macOS**: macOS 10.14+
-
-### 依赖库
-
-```bash
-# Ubuntu/Debian
-sudo apt-get update
-sudo apt-get install build-essential cmake qt6-base-dev libcurl4-openssl-dev
-
-# CentOS/RHEL
-sudo yum groupinstall "Development Tools"
-sudo yum install cmake qt6-qtbase-devel libcurl-devel
-
-# macOS (Homebrew)
-brew install cmake qt6 curl
-```
-
-## 编译和运行
-
-### 1. 克隆项目
-```bash
-git clone <repository-url>
-cd MathExamSystem
-```
-
-### 2. 创建构建目录
-
-```bash
-mkdir build
-cd build
-```
-
-### 3. 配置项目
-```bash
-cmake ..
-```
-
-### 4. 编译项目
-```bash
-# Linux/macOS
-make -j4
-
-# Windows (Visual Studio)
-cmake --build . --config Release
-```
-
-### 5. 运行程序
-
-```bash
-# Linux/macOS
-./MathExamSystem
-
-# Windows
-./Release/MathExamSystem.exe
-```
-
-## 使用指南
-
-### 首次使用
-
-1. **启动程序**：运行编译后的可执行文件
-2. **注册账号**：
-   - 点击"注册新账号"
-   - 输入邮箱地址，点击"发送验证码"
-   - 检查邮箱获取验证码并填写
-   - 设置用户名和密码（6-10位，包含大小写字母和数字）
-   - 点击"注册"
-
-3. **登录系统**：
-   - 输入用户名和密码
-   - 点击"登录"
-
-### 开始学习
-
-1. **选择难度**：
-   - 小学：基础四则运算
-   - 初中：包含平方、开根号
-   - 高中：包含三角函数
-
-2. **设置题目数量**：通过数字选择框设置（5-50题）
-
-3. **开始测试**：点击"开始测试"进入答题界面
-
-### 答题流程
-
-1. **阅读题目**：仔细阅读题目内容
-2. **选择答案**：从A、B、C、D四个选项中选择
-3. **导航题目**：
-   - 使用"上一题"、"下一题"按钮切换
-   - 最后一题显示"提交试卷"按钮
-4. **提交答案**：完成所有题目后提交
-
-### 查看结果
-
- 系统自动批改并显示得分
- 查看正确题目数量和总题目数
- 可选择"继续做题"或"退出"
-
-## 配置说明
-
-### 邮件服务配置
-
-如需使用邮箱验证功能，请编辑 `backend_interface.cc` 中的邮箱配置：
-
-```cpp
-email_config_.smtp_server = "smtp.163.com";
-email_config_.smtp_port = 587;
-email_config_.username = "your_email@163.com";
-email_config_.password = "your_authorization_code";
-```
-
-**注意**：
- 使用163邮箱需要开启SMTP服务并获取授权码
- 授权码不是登录密码
- 其他邮箱服务商配置类似
-
-### 数据文件说明
-
- `users.csv`：用户数据文件（自动生成）
- `用户名/` 目录：用户题目历史记录
- 日志输出到控制台
-
-## 常见问题
-
-### Q: 编译时找不到Qt库
-
-A: 确保已安装Qt开发包，并设置正确的CMAKE_PREFIX_PATH
-```bash
-cmake -DCMAKE_PREFIX_PATH=/path/to/qt ..
-```
-
-### Q: 邮件发送失败
-
-A: 
-1. 检查邮箱配置是否正确
-2. 确认网络连接正常
-3. 检查防火墙设置
-
-### Q: 题目生成失败
-A: 
-1. 检查是否有写入权限
-2. 确认磁盘空间充足
-
-### Q: 程序崩溃
-A: 
-1. 检查依赖库版本兼容性
-2. 查看控制台输出的错误信息
-
-## 开发指南
-
-### 添加新的题目类型
-
-1. 在 `problem_generator.h` 中定义新的生成器类
-2. 实现 `GenerateProblem()` 方法
-3. 在工厂类中注册新的生成器
-
-### 扩展用户界面
-
-1. 继承 `BaseWidget` 创建新的界面组件
-2. 在 `main_window.h` 中声明新的界面
-3. 在 `main_window.cc` 中管理界面切换
-
-
-
-## 类说明请看doc/ExamSystem.md
-
--- a/doc/examsystem.md
+++ b/doc/examsystem.md
@ -1,854 +0,0 @@
-# 数学学习考试系统 - 项目说明
-
-## 项目简介
-
-一个基于C++和Qt框架开发的跨平台数学学习考试系统，支持小学、初中、高中三个学段的数学题目生成、在线答题、成绩统计等功能。系统采用前后端分离架构。
-
-## 功能特性
-
-### 🔐 用户管理
-
- 用户注册（邮箱验证码验证）
- 用户登录/登出
- 密码修改
- 个人信息查看
-
-### 📚 题目生成
-
- **小学**：基础四则运算，确保结果非负
- **初中**：包含平方、开根号运算
- **高中**：包含三角函数运算
- 智能查重，避免重复题目
- 历史题目保存和加载
-
-### 🎯 考试功能
-
- 自定义题目数量（5-50题）
- 实时答题进度显示
- 上一题/下一题导航
- 自动批改和成绩统计
- 错题回顾
-
-### 💾 数据管理
-
- 用户数据持久化存储
- 题目历史记录保存
- 自动备份和恢复
-
-## 技术栈
-
-### 前端
-
- **框架**：Qt 5/6
- **语言**：C++
- **UI组件**：QWidget、QStackedWidget、QPushButton等
-
-### 后端
-
- **核心架构**：模块化设计，工厂模式
- **数学计算**：表达式解析和求值
- **文件管理**：CSV格式用户数据，TXT格式题目存储
- **邮件服务**：libcurl + SMTP协议
-
-### 开发工具
-
- **编译器**：支持C++11的编译器（gcc/clang/MSVC）
- **构建工具**：CMake
- **版本控制**：Git
-
-## 项目结构
-
-```
-MathExamSystem/
-├── frontend/                  # 前端界面
-│   ├── base_widget.h/.cc     # 基础窗口组件
-│   ├── login_widget.h/.cc    # 登录注册界面
-│   ├── selection_widget.h/.cc # 难度选择界面
-│   ├── question_widget.h/.cc # 答题界面
-│   ├── result_widget.h/.cc   # 成绩显示界面
-│   ├── main_window.h/.cc     # 主窗口管理
-│   └── change_password_dialog.h/.cc # 修改密码对话框
-├── backend/                   # 后端核心
-│   ├── exam_system/          # 考试系统核心
-│   │   ├── exam_system.h/.cc # 系统控制层
-│   │   ├── problem_generator.h/.cc # 题目生成器
-│   │   ├── duplicate_checker.h/.cc # 重复检查器
-│   │   └── input_validator.h/.cc   # 输入验证器
-│   ├── file_manager/         # 文件管理
-│   │   └── file_manager.h/.cc
-│   └── logger/               # 日志系统
-│       └── logger.h/.cc
-├── shared/                   # 共享接口
-│   └── backend_interface.h/.cc # 前后端通信接口
-├── main.cc                   # 程序入口
-└── CMakeLists.txt           # 构建配置
-```
-
-## 环境要求
-
-### 系统要求
-
- **Windows**: Windows 10/11, Visual Studio 2019+
- **Linux**: Ubuntu 18.04+, CentOS 7+
- **macOS**: macOS 10.14+
-
-### 依赖库
-
-```bash
-# Ubuntu/Debian
-sudo apt-get update
-sudo apt-get install build-essential cmake qt6-base-dev libcurl4-openssl-dev
-
-# CentOS/RHEL
-sudo yum groupinstall "Development Tools"
-sudo yum install cmake qt6-qtbase-devel libcurl-devel
-
-# macOS (Homebrew)
-brew install cmake qt6 curl
-```
-
-## 编译和运行
-
-### 1. 克隆项目
-
-```bash
-git clone <repository-url>
-cd MathExamSystem
-```
-
-### 2. 创建构建目录
-
-```bash
-mkdir build
-cd build
-```
-
-### 3. 配置项目
-
-```bash
-cmake ..
-```
-
-### 4. 编译项目
-
-```bash
-# Linux/macOS
-make -j4
-
-# Windows (Visual Studio)
-cmake --build . --config Release
-```
-
-### 5. 运行程序
-
-```bash
-# Linux/macOS
-./MathExamSystem
-
-# Windows
-./Release/MathExamSystem.exe
-```
-
-## 使用指南
-
-### 首次使用
-
-1. **启动程序**：运行编译后的可执行文件
-2. **注册账号**：
-   - 点击"注册新账号"
-   - 输入邮箱地址，点击"发送验证码"
-   - 检查邮箱获取验证码并填写
-   - 设置用户名和密码（6-10位，包含大小写字母和数字）
-   - 点击"注册"
-
-3. **登录系统**：
-   - 输入用户名和密码
-   - 点击"登录"
-
-### 开始学习
-
-1. **选择难度**：
-   - 小学：基础四则运算
-   - 初中：包含平方、开根号
-   - 高中：包含三角函数
-
-2. **设置题目数量**：通过数字选择框设置（5-50题）
-
-3. **开始测试**：点击"开始测试"进入答题界面
-
-### 答题流程
-
-1. **阅读题目**：仔细阅读题目内容
-2. **选择答案**：从A、B、C、D四个选项中选择
-3. **导航题目**：
-   - 使用"上一题"、"下一题"按钮切换
-   - 最后一题显示"提交试卷"按钮
-4. **提交答案**：完成所有题目后提交
-
-### 查看结果
-
- 系统自动批改并显示得分
- 查看正确题目数量和总题目数
- 可选择"继续做题"或"退出"
-
-## 配置说明
-
-### 邮件服务配置
-
-如需使用邮箱验证功能，请编辑 `backend_interface.cc` 中的邮箱配置：
-
-```cpp
-email_config_.smtp_server = "smtp.163.com";
-email_config_.smtp_port = 587;
-email_config_.username = "your_email@163.com";
-email_config_.password = "your_authorization_code";
-```
-
-**注意**：
-
- 使用163邮箱需要开启SMTP服务并获取授权码
- 授权码不是登录密码
- 其他邮箱服务商配置类似
-
-
-
-### 数据文件说明
-
- `users.csv`：用户数据文件（自动生成）
- `用户名/` 目录：用户题目历史记录
- 日志输出到控制台
-
-## 常见问题
-
-### Q: 编译时找不到Qt库
-
-A: 确保已安装Qt开发包，并设置正确的CMAKE_PREFIX_PATH
-
-```bash
-cmake -DCMAKE_PREFIX_PATH=/path/to/qt ..
-```
-
-### Q: 邮件发送失败
-
-A: 
-
-1. 检查邮箱配置是否正确
-2. 确认网络连接正常
-3. 检查防火墙设置
-
-### Q: 题目生成失败
-
-A: 
-
-1. 检查是否有写入权限
-2. 确认磁盘空间充足
-
-### Q: 程序崩溃
-
-A: 
-
-1. 检查依赖库版本兼容性
-2. 查看控制台输出的错误信息
-
-## 开发指南
-
-### 添加新的题目类型
-
-1. 在 `problem_generator.h` 中定义新的生成器类
-2. 实现 `GenerateProblem()` 方法
-3. 在工厂类中注册新的生成器
-
-### 扩展用户界面
-
-1. 继承 `BaseWidget` 创建新的界面组件
-2. 在 `main_window.h` 中声明新的界面
-3. 在 `main_window.cc` 中管理界面切换
-
-# 数学学习考试系统 - 系统框架和设计说明
-
-## 系统架构概览
-
-```mermaid
-graph TB
-    subgraph Frontend[<b>前端界面层</b>]
-        A1[LoginWidget]
-        A2[SelectionWidget]
-        A3[QuestionWidget]
-        A4[ResultWidget]
-    end
-
-    subgraph Interface[<b>接口适配层</b>]
-        B1[BackendInterface]
-        B2[BackendImpl]
-    end
-
-    subgraph Business[<b>业务逻辑层</b>]
-        C1[ExamSystem]
-    end
-
-    subgraph Services[<b>服务组件层</b>]
-        D1[ProblemGenerator]
-        D2[UserManager]
-        D3[FileManager]
-        D4[DuplicateChecker]
-    end
-
-    A1 & A2 & A3 & A4 --> B1
-    B1 --> B2
-    B2 --> C1
-    C1 --> D1 & D2 & D3 & D4
-    
-    classDef frontend fill:#e1f5fe,stroke:#01579b,stroke-width:2px
-    classDef interface fill:#f3e5f5,stroke:#4a148c,stroke-width:2px
-    classDef business fill:#e8f5e8,stroke:#1b5e20,stroke-width:2px
-    classDef services fill:#fff3e0,stroke:#e65100,stroke-width:2px
-
-    class A1,A2,A3,A4 frontend
-    class B1,B2 interface
-    class C1 business
-    class D1,D2,D3,D4 services
-
-```
-
-## 详细架构设计
-
-### 1. 前端界面层 (Frontend Layer)
-
-#### 1.1 界面组件架构
-```
-MainWindow (主窗口容器)
-    ├── QStackedWidget (页面堆栈管理器)
-    │   ├── LoginWidget (登录注册界面)
-    │   ├── SelectionWidget (难度选择界面)
-    │   ├── QuestionWidget (答题界面)
-    │   └── ResultWidget (成绩显示界面)
-    └── ChangePasswordDialog (修改密码对话框)
-```
-
-#### 1.2 界面状态流转
-```
-登录界面 → 选择界面 → 答题界面 → 结果界面
-    ↑         │          │         │
-    └─────────┴──────────┴─────────┘
-         (重新开始/退出登录)
-```
-
-#### 1.3 前端设计模式
- **组合模式**: BaseWidget作为所有界面的基类
- **观察者模式**: Qt信号槽机制实现组件间通信
- **状态模式**: 通过QStackedWidget管理不同界面状态
-
-### 2. 接口适配层 (Interface Layer)
-
-#### 2.1 接口设计原则
-```cpp
-// 抽象接口 - 面向抽象编程
-class BackendInterface {
-public:
-    virtual bool UserLogin(...) = 0;
-    virtual bool UserRegister(...) = 0;
-    virtual std::vector<QuestionInfo> GenerateQuestions(...) = 0;
-    // ... 其他接口方法
-};
-
-// 具体实现 - 委托给业务层
-class BackendImpl : public BackendInterface {
-private:
-    std::unique_ptr<ExamSystem> exam_system_;
-    // 实现所有接口方法，委托给exam_system_
-};
-```
-
-#### 2.2 数据转换职责
- 将前端数据结构转换为后端可处理格式
- 将后端返回数据转换为前端显示格式
- 处理验证码管理和邮件发送
-
-### 3. 业务逻辑层 (Business Layer)
-
-#### 3.1 ExamSystem 核心控制器
-```cpp
-class ExamSystem {
-    // 用户会话管理
-    std::map<std::string, UserSession> user_sessions_;
-    
-    // 业务组件
-    DuplicateChecker duplicate_checker_;
-    SystemConfig config_;
-    
-    // 核心业务方法
-    LoginResponse Login(const LoginRequest& request);
-    GenerateResponse GenerateProblems(const GenerateRequest& request);
-    // ... 其他业务方法
-};
-```
-
-#### 3.2 用户会话管理
-```cpp
-struct UserSession {
-    std::unique_ptr<ProblemGenerator> generator;  // 题目生成器
-    std::string current_type;                     // 当前类型
-    bool history_loaded = false;                  // 历史加载状态
-};
-```
-
-### 4. 服务组件层 (Service Components)
-
-#### 4.1 题目生成子系统
-```
-ProblemGenerator (抽象基类)
-    ├── PrimarySchoolGenerator (小学生成器)
-    ├── MiddleSchoolGenerator (初中生成器)
-    └── HighSchoolGenerator (高中生成器)
-    
-ProblemGeneratorFactory (工厂类)
-```
-
-**题目生成策略**:
- **小学**: 确保运算结果不为负数
- **初中**: 包含平方(²)和开根号(√)运算
- **高中**: 包含三角函数(sin/cos/tan)运算
-
-#### 4.2 重复检查子系统
-```cpp
-class DuplicateChecker {
-private:
-    std::map<std::string, std::vector<std::string>> user_problems_;
-    std::set<std::string> loaded_users_;
-    
-public:
-    bool CheckDuplicate(const std::string& username, const std::string& problem);
-    void LoadUserHistory(const std::string& username);
-};
-```
-
-#### 4.3 文件管理子系统
-```cpp
-class FileManager {
-public:
-    // 用户目录管理
-    static bool CreateUserDirectory(const std::string& username);
-    
-    // 题目持久化
-    static bool SaveProblemsToFile(const std::string& username, 
-                                  const std::vector<std::string>& problems);
-    
-    // 历史记录加载
-    static std::vector<std::string> LoadUserHistoryProblems(const std::string& username);
-};
-```
-
-#### 4.4 邮件服务子系统
-```cpp
-class EmailService {
-private:
-    EmailConfig config_;
-    
-public:
-    bool SendVerificationCode(const std::string& email, const std::string& code);
-    bool SendEmailViaCurl(const std::string& recipient,
-                         const std::string& subject,
-                         const std::string& body);
-};
-```
-
-## 核心设计模式详解
-
-### 1. 分层架构模式 (Layered Architecture)
-```
-表现层 (Presentation) → 应用层 (Application) → 领域层 (Domain) → 基础设施层 (Infrastructure)
-    前端界面                接口适配             业务逻辑           文件/邮件/日志
-```
-
-### 2. 工厂模式 (Factory Pattern)
-```cpp
-// 题目生成器工厂
-std::unique_ptr<ProblemGenerator> ProblemGeneratorFactory::CreateGenerator(
-    const std::string& type) {
-    if (type == "小学") return std::make_unique<PrimarySchoolGenerator>();
-    if (type == "初中") return std::make_unique<MiddleSchoolGenerator>();
-    if (type == "高中") return std::make_unique<HighSchoolGenerator>();
-    return nullptr;
-}
-```
-
-### 3. 策略模式 (Strategy Pattern)
-```cpp
-// 不同难度的题目生成策略
-class ProblemGenerator {
-public:
-    virtual std::string GenerateProblem() = 0;  // 策略接口
-};
-
-class PrimarySchoolGenerator : public ProblemGenerator {
-    std::string GenerateProblem() override {
-        // 小学题目生成策略
-    }
-};
-```
-
-### 4. 门面模式 (Facade Pattern)
-```cpp
-// BackendImpl作为门面，简化复杂后端系统的使用
-class BackendImpl : public BackendInterface {
-public:
-    bool UserLogin(...) override {
-        // 内部协调多个子系统完成登录
-        return exam_system_->Login(request).success;
-    }
-};
-```
-
-## 数据流设计
-
-### 1. 用户登录数据流
-```
-1. 用户输入 → LoginWidget → BackendInterface → BackendImpl
-2. BackendImpl → ExamSystem → 用户验证 → 创建会话
-3. 返回结果 → 前端界面更新
-```
-
-### 2. 题目生成数据流
-```
-1. 用户选择 → SelectionWidget → GenerateQuestions请求
-2. BackendImpl → ExamSystem → ProblemGeneratorFactory
-3. 生成题目 → DuplicateChecker查重 → 保存到文件
-4. 返回题目列表 → 前端显示
-```
-
-### 3. 答案提交数据流
-```
-1. 用户答案 → QuestionWidget → SubmitAnswers请求
-2. BackendImpl → 答案验证 → 成绩计算
-3. 返回TestResult → ResultWidget显示
-```
-
-## 持久化设计
-
-### 1. 用户数据存储
-```csv
-# users.csv 格式
-username,password,user_type,email
-zhangsan1,123,小学,zhangsan1@example.com
-lisi1,123,初中,lisi1@example.com
-```
-
-### 2. 题目历史存储
-```
-用户名目录/
-    ├── 2024-01-15-10-30-25.txt
-    ├── 2024-01-16-14-20-10.txt
-    └── ...
-```
-
-### 3. 会话状态管理
- 内存中维护用户会话
- 验证码有时效性(5分钟)
- 题目缓存提高性能
-
-# 数学学习考试系统 - 类说明
-
-## 前端界面类
-
-### BaseWidget (基础窗口组件)
-
-**文件**: `base_widget.h`, `base_widget.cc`
-
- **职责**: 所有前端窗口组件的基类，提供公共功能和成员变量
- **继承关系**: 继承自 `QWidget`
- **主要成员**:
-  - `backend`: 指向后端接口的指针
- **主要方法**:
-  - `BaseWidget()`: 构造函数，初始化后端接口
-  - `showMessage()`: 显示消息对话框的公共方法
-  - `setupUI()`: 纯虚方法，子类必须实现的界面初始化方法
-
-### LoginWidget (登录注册界面)
-
-**文件**: `login_widget.h`, `login_widget.cc`
-
- **职责**: 处理用户登录和注册功能
- **继承关系**: 继承自 `BaseWidget`
- **主要成员**:
-  - `loginPage`, `registerPage`: 登录和注册页面组件
-  - `stackedWidget`: 页面堆栈，用于切换登录/注册页面
-  - 各种输入框和按钮组件
- **主要方法**:
-  - `onLoginClicked()`: 处理登录按钮点击
-  - `onRegisterClicked()`: 处理注册按钮点击
-  - `onSendCodeClicked()`: 发送验证码
-  - `validatePassword()`: 验证密码格式
-
-### SelectionWidget (难度选择界面)
-
-**文件**: `selection_widget.h`, `selection_widget.cc`
-
- **职责**: 提供难度选择和系统菜单功能
- **继承关系**: 继承自 `BaseWidget`
- **主要成员**:
-  - `primaryBtn`, `juniorBtn`, `seniorBtn`: 难度选择按钮
-  - `countSpinBox`: 题目数量选择框
-  - `menuBar`: 菜单栏，包含用户和系统菜单
- **主要方法**:
-  - `onPrimaryClicked()`: 选择小学难度
-  - `onJuniorClicked()`: 选择初中难度
-  - `onSeniorClicked()`: 选择高中难度
-  - `onStartClicked()`: 开始测试
-  - `onChangePasswordClicked()`: 修改密码
-
-### QuestionWidget (答题界面)
-
-**文件**: `question_widget.h`, `question_widget.cc`
-
- **职责**: 显示题目和选项，处理用户答题过程
- **继承关系**: 继承自 `BaseWidget`
- **主要成员**:
-  - `questionLabel`: 题目显示标签
-  - `optionButtons[4]`: 选项单选按钮
-  - `progressLabel`: 进度显示标签
-  - `questions_`: 题目列表
-  - `user_answers_`: 用户答案列表
- **主要方法**:
-  - `startTest()`: 开始测试
-  - `showQuestion()`: 显示指定题目
-  - `onNextClicked()`: 下一题
-  - `onPrevClicked()`: 上一题
-  - `onSubmitClicked()`: 提交答案
-
-### ResultWidget (成绩显示界面)
-
-**文件**: `result_widget.h`, `result_widget.cc`
-
- **职责**: 显示测试结果和提供后续操作
- **继承关系**: 继承自 `BaseWidget`
- **主要成员**:
-  - `scoreLabel`: 分数显示标签
-  - `detailLabel`: 详细信息标签
-  - `restartBtn`, `exitBtn`: 操作按钮
- **主要方法**:
-  - `showResult()`: 显示测试结果
-  - 信号: `restartTest()`, `exitTest()`
-
-### MainWindow (主窗口)
-
-**文件**: `main_window.h`, `main_window.cc`
-
- **职责**: 管理所有界面的切换和协调
- **继承关系**: 继承自 `QMainWindow`
- **主要成员**:
-  - `stackedWidget`: 堆栈窗口，管理所有界面
-  - 各个界面组件的指针
- **主要方法**:
-  - `showSelection()`: 显示选择界面
-  - `showQuestions()`: 显示答题界面
-  - `showResult()`: 显示结果界面
-  - `logout()`: 用户登出
-
-### ChangePasswordDialog (修改密码对话框)
-
-**文件**: `change_password_dialog.h`, `change_password_dialog.cc`
-
- **职责**: 处理用户修改密码功能
- **继承关系**: 继承自 `QDialog`
- **主要方法**:
-  - `onChangePasswordClicked()`: 确认修改密码
-  - `validatePassword()`: 实时验证密码格式
-
---
-
-## 后端核心类
-
-### ExamSystem (考试系统核心)
-
-**文件**: `exam_system.h`, `exam_system.cc`
-
- **职责**: 系统的核心控制层，协调所有业务逻辑
- **主要成员**:
-  - `config_`: 系统配置信息
-  - `user_sessions_`: 用户会话映射表
-  - `duplicate_checker_`: 重复检查器实例
- **主要方法**:
-  - `Login()`: 用户登录
-  - `Logout()`: 用户登出
-  - `GenerateProblems()`: 生成题目
-  - `ChangePassword()`: 修改密码
-  - `CalculateAnswer()`: 计算表达式答案
-
-### ProblemGenerator (题目生成器基类)
-
-**文件**: `problem_generator.h`, `problem_generator.cc`
-
- **职责**: 定义题目生成器的统一接口
- **主要方法**:
-  - `GenerateProblem()`: 生成单个题目（纯虚）
-  - `GetCurrentType()`: 获取生成器类型（纯虚）
-  - `ValidateProblem()`: 验证题目有效性（纯虚）
-
-### PrimarySchoolGenerator (小学题目生成器)
-
-**职责**: 生成小学难度的数学题目
-
- **特点**: 基础四则运算，确保结果不为负数
- **主要方法**:
-  - `GenerateNonNegativeExpression()`: 生成非负表达式
-
-### MiddleSchoolGenerator (初中题目生成器)
-
-**职责**: 生成初中难度的数学题目
-
- **特点**: 包含平方和开根号运算
- **主要方法**:
-  - `GenerateSquareOrRoot()`: 生成平方或开根号表达式
-
-### HighSchoolGenerator (高中题目生成器)
-
-**职责**: 生成高中难度的数学题目
-
- **特点**: 包含三角函数运算
- **主要方法**:
-  - `GenerateTrigonometricFunction()`: 生成三角函数表达式
-
-### ProblemGeneratorFactory (生成器工厂)
-
-**职责**: 创建指定类型的题目生成器
-
- **主要方法**:
-  - `CreateGenerator()`: 根据类型创建生成器实例
-
-### DuplicateChecker (重复检查器)
-
-**文件**: `duplicate_checker.h`, `duplicate_checker.cc`
-
- **职责**: 管理用户已生成的题目，防止重复
- **主要成员**:
-  - `user_problems_`: 用户题目映射表
-  - `loaded_users_`: 已加载历史的用户集合
- **主要方法**:
-  - `AddProblem()`: 添加题目到用户记录
-  - `CheckDuplicate()`: 检查题目是否重复
-  - `LoadUserHistory()`: 加载用户历史题目
-
-### FileManager (文件管理器)
-
-**文件**: `file_manager.h`, `file_manager.cc`
-
- **职责**: 负责文件的创建、保存和加载操作
- **主要方法**:
-  - `CreateUserDirectory()`: 创建用户目录
-  - `SaveProblemsToFile()`: 保存题目到文件
-  - `LoadUserHistoryProblems()`: 加载用户历史题目
-
-### Logger (日志记录器)
-
-**文件**: `logger.h`, `logger.cc`
-
- **职责**: 提供分级日志记录功能
- **日志级别**: DEBUG, INFO, WARNING, ERROR
- **主要方法**:
-  - `Log()`: 记录日志
-  - `Debug()`, `Info()`, `Warning()`, `Error()`: 便捷方法
-
-### InputValidator (输入验证器)
-
-**文件**: `input_validator.h`, `input_validator.cc`
-
- **职责**: 提供各种输入数据的验证功能
- **主要方法**:
-  - `ValidateUsername()`: 验证用户名格式
-  - `ValidatePassword()`: 验证密码格式
-  - `ValidateUserType()`: 验证用户类型
-
---
-
-## 接口和数据类
-
-### BackendInterface (后端接口)
-
-**文件**: `backend_interface.h`
-
- **职责**: 定义前后端通信的抽象接口
- **主要方法**:
-  - `UserLogin()`, `UserRegister()`: 用户认证
-  - `GenerateQuestions()`: 生成题目
-  - `SubmitAnswers()`: 提交答案
-  - `SendVerificationCode()`: 发送验证码
-
-### BackendImpl (后端实现)
-
-**文件**: `backend_interface.cc`
-
- **职责**: 实现BackendInterface，具体处理后端逻辑
- **主要成员**:
-  - `exam_system_`: ExamSystem核心实例
-  - `verification_codes_`: 验证码管理
-  - `user_questions_`: 用户题目缓存
- **主要方法**:
-  - `GenerateOptions()`: 生成选择题选项
-  - `SendEmailViaCurl()`: 通过libcurl发送邮件
-
---
-
-## 数据结构
-
-### UserInfo (用户信息)
-
-```cpp
-struct UserInfo {
-  std::string username;
-  std::string password;
-  std::string user_type;  // 小学/初中/高中
-  std::string email;
-};
-```
-
-### QuestionInfo (题目信息)
-
-```cpp
-struct QuestionInfo {
-    int id;
-    std::string content;
-    std::vector<std::string> options;
-    int correct_answer;  // 0-3 对应ABCD
-};
-```
-
-### TestResult (测试结果)
-
-```cpp
-struct TestResult {
-    int total_questions;
-    int correct_answers;
-    double score;
-    std::string difficulty;
-};
-```
-
-### VerificationCode (验证码信息)
-
-```cpp
-struct VerificationCode {
-    std::string code;
-    std::time_t generate_time;
-    std::string email;
-};
-```
-
---
-
-## 设计模式应用
-
-1. **工厂模式**: `ProblemGeneratorFactory` 创建不同类型的题目生成器
-2. **策略模式**: 不同难度的题目生成器实现相同的接口
-3. **观察者模式**: Qt的信号槽机制实现组件间通信
-4. **单例模式**: `Logger` 提供全局日志服务
-5. **门面模式**: `BackendImpl` 封装复杂后端逻辑，提供简单接口
-
-## 数据流说明
-
-```
-用户操作 → 前端界面 → BackendInterface → BackendImpl → ExamSystem
-    ↓                                                            ↓
-界面更新 ←   信号槽     ←   返回结果   ←   业务处理   ←   题目生成器
-```
-
-这个类结构体现了清晰的分层架构，前端负责用户交互，后端处理业务逻辑，接口层负责通信协调，使得系统具有良好的可维护性和可扩展性。
--- a/examSystem.pro
+++ b/examSystem.pro
@ -29,4 +29,3 @@ CONFIG += embed_translations
 qnx: target.path = /tmp/$${TARGET}/bin
 else: unix:!android: target.path = /opt/$${TARGET}/bin
 !isEmpty(target.path): INSTALLS += target
-
--- a/frontend/Makefile
+++ b/frontend/Makefile
@ -0,0 +1,687 @@
+#############################################################################
+# Makefile for building: examSystem
+# Generated by qmake (3.1) (Qt 6.5.3)
+# Project:  examSystem.pro
+# Template: app
+# Command: E:\Qt\6.5.3\mingw_64\bin\qmake.exe -o Makefile examSystem.pro
+#############################################################################
+
+MAKEFILE      = Makefile
+
+EQ            = =
+
+first: release
+install: release-install
+uninstall: release-uninstall
+QMAKE         = E:\Qt\6.5.3\mingw_64\bin\qmake.exe
+DEL_FILE      = del
+CHK_DIR_EXISTS= if not exist
+MKDIR         = mkdir
+COPY          = copy /y
+COPY_FILE     = copy /y
+COPY_DIR      = xcopy /s /q /y /i
+INSTALL_FILE  = copy /y
+INSTALL_PROGRAM = copy /y
+INSTALL_DIR   = xcopy /s /q /y /i
+QINSTALL      = E:\Qt\6.5.3\mingw_64\bin\qmake.exe -install qinstall
+QINSTALL_PROGRAM = E:\Qt\6.5.3\mingw_64\bin\qmake.exe -install qinstall -exe
+DEL_FILE      = del
+SYMLINK       = $(QMAKE) -install ln -f -s
+DEL_DIR       = rmdir
+MOVE          = move
+IDC           = idc
+IDL           = midl
+ZIP           = zip -r -9
+DEF_FILE      = 
+RES_FILE      = 
+SED           = $(QMAKE) -install sed
+MOVE          = move
+SUBTARGETS    =  \
+		release \
+		debug
+
+
+release: FORCE
+	$(MAKE) -f $(MAKEFILE).Release
+release-make_first: FORCE
+	$(MAKE) -f $(MAKEFILE).Release 
+release-all: FORCE
+	$(MAKE) -f $(MAKEFILE).Release all
+release-clean: FORCE
+	$(MAKE) -f $(MAKEFILE).Release clean
+release-distclean: FORCE
+	$(MAKE) -f $(MAKEFILE).Release distclean
+release-install: FORCE
+	$(MAKE) -f $(MAKEFILE).Release install
+release-uninstall: FORCE
+	$(MAKE) -f $(MAKEFILE).Release uninstall
+debug: FORCE
+	$(MAKE) -f $(MAKEFILE).Debug
+debug-make_first: FORCE
+	$(MAKE) -f $(MAKEFILE).Debug 
+debug-all: FORCE
+	$(MAKE) -f $(MAKEFILE).Debug all
+debug-clean: FORCE
+	$(MAKE) -f $(MAKEFILE).Debug clean
+debug-distclean: FORCE
+	$(MAKE) -f $(MAKEFILE).Debug distclean
+debug-install: FORCE
+	$(MAKE) -f $(MAKEFILE).Debug install
+debug-uninstall: FORCE
+	$(MAKE) -f $(MAKEFILE).Debug uninstall
+
+Makefile: examSystem.pro ../../../Qt/6.5.3/mingw_64/mkspecs/win32-g++/qmake.conf ../../../Qt/6.5.3/mingw_64/mkspecs/features/spec_pre.prf \
+		../../../Qt/6.5.3/mingw_64/mkspecs/features/device_config.prf \
+		../../../Qt/6.5.3/mingw_64/mkspecs/common/sanitize.conf \
+		../../../Qt/6.5.3/mingw_64/mkspecs/common/gcc-base.conf \
+		../../../Qt/6.5.3/mingw_64/mkspecs/common/g++-base.conf \
+		../../../Qt/6.5.3/mingw_64/mkspecs/features/win32/windows_vulkan_sdk.prf \
+		../../../Qt/6.5.3/mingw_64/mkspecs/common/windows-vulkan.conf \
+		../../../Qt/6.5.3/mingw_64/mkspecs/common/g++-win32.conf \
+		../../../Qt/6.5.3/mingw_64/mkspecs/common/windows-desktop.conf \
+		../../../Qt/6.5.3/mingw_64/mkspecs/qconfig.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_ext_freetype.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_ext_libjpeg.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_ext_libpng.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3danimation.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3danimation_private.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3dcore.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3dcore_private.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3dextras.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3dextras_private.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3dinput.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3dinput_private.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3dlogic.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3dlogic_private.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3dquick.pri \
+		../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_3dquick_private.pri \
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+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quick3dutils.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quick3dutils_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quick_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickcontrols2.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickcontrols2_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickcontrols2impl.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickcontrols2impl_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickcontrolstestutilsprivate_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickdialogs2.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickdialogs2_private.pri:
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+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickdialogs2quickimpl_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickdialogs2utils.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickdialogs2utils_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickeffects_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quicklayouts.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quicklayouts_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickparticles_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickshapes_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quicktemplates2.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quicktemplates2_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quicktestutilsprivate_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quicktimeline.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quicktimeline_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickwidgets.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_quickwidgets_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_remoteobjects.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_remoteobjects_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_remoteobjectsqml.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_remoteobjectsqml_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_repparser.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_repparser_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_scxml.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_scxml_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_scxmlqml.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_scxmlqml_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_sensors.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_sensors_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_sensorsquick.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_sensorsquick_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_serialbus.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_serialbus_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_serialport.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_serialport_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_shadertools.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_shadertools_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_spatialaudio.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_spatialaudio_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_sql.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_sql_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_statemachine.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_statemachine_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_statemachineqml.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_statemachineqml_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_svg.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_svg_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_svgwidgets.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_svgwidgets_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_testlib.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_testlib_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_texttospeech.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_texttospeech_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_tools_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_uiplugin.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_uitools.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_uitools_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_virtualkeyboard.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_virtualkeyboard_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_webchannel.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_webchannel_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_websockets.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_websockets_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_webview.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_webview_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_webviewquick.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_webviewquick_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_widgets.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_widgets_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_xml.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_xml_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/modules/qt_lib_zlib_private.pri:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/qt_functions.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/qt_config.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/win32-g++/qmake.conf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/spec_post.prf:
+../.qmake.stash:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/exclusive_builds.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/toolchain.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/default_pre.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/win32/default_pre.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/resolve_config.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/exclusive_builds_post.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/default_post.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/lrelease.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/entrypoint.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/precompile_header.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/warn_on.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/qt.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/resources_functions.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/resources.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/moc.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/win32/opengl.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/uic.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/qmake_use.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/file_copies.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/win32/windows.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/testcase_targets.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/exceptions.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/yacc.prf:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/lex.prf:
+examSystem.pro:
+../../../Qt/6.5.3/mingw_64/lib/Qt6Widgets.prl:
+../../../Qt/6.5.3/mingw_64/lib/Qt6Gui.prl:
+../../../Qt/6.5.3/mingw_64/lib/Qt6Core.prl:
+../../../Qt/6.5.3/mingw_64/lib/Qt6EntryPoint.prl:
+../../../Qt/6.5.3/mingw_64/mkspecs/features/build_pass.prf:
+release/qmake_qmake_qm_files.qrc:
+debug/qmake_qmake_qm_files.qrc:
+qmake: FORCE
+	@$(QMAKE) -o Makefile examSystem.pro
+
+qmake_all: FORCE
+
+make_first: release-make_first debug-make_first  FORCE
+all: release-all debug-all  FORCE
+clean: release-clean debug-clean  FORCE
+distclean: release-distclean debug-distclean  FORCE
+	-$(DEL_FILE) Makefile
+
+release-mocclean:
+	$(MAKE) -f $(MAKEFILE).Release mocclean
+debug-mocclean:
+	$(MAKE) -f $(MAKEFILE).Debug mocclean
+mocclean: release-mocclean debug-mocclean
+
+release-mocables:
+	$(MAKE) -f $(MAKEFILE).Release mocables
+debug-mocables:
+	$(MAKE) -f $(MAKEFILE).Debug mocables
+mocables: release-mocables debug-mocables
+
+check: first
+
+benchmark: first
+FORCE:
+
+.SUFFIXES:
+
+$(MAKEFILE).Release: Makefile
+$(MAKEFILE).Debug: Makefile
--- a/frontend/Makefile.Debug
+++ b/frontend/Makefile.Debug
--- a/frontend/Makefile.Release
+++ b/frontend/Makefile.Release
--- a/frontend/debug/object_script.examSystem.Debug
+++ b/frontend/debug/object_script.examSystem.Debug
@ -0,0 +1,14 @@
+debug/main.o
+debug/main_window.o
+debug/login_widget.o
+debug/selection_widget.o
+debug/question_widget.o
+debug/result_widget.o
+debug/base_widget.o
+debug/qrc_qmake_qmake_qm_files.o
+debug/moc_main_window.o
+debug/moc_login_widget.o
+debug/moc_selection_widget.o
+debug/moc_question_widget.o
+debug/moc_result_widget.o
+debug/moc_base_widget.o
--- a/frontend/debug/qmake_qmake_qm_files.qrc
+++ b/frontend/debug/qmake_qmake_qm_files.qrc
@ -0,0 +1,5 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource prefix="i18n">
+<file alias="examSystem_zh_CN.qm">E:/qt_project/examSystem/frontend/debug/examSystem_zh_CN.qm</file>
+</qresource>
+</RCC>
--- a/frontend/examSystem_zh_CN.ts
+++ b/frontend/examSystem_zh_CN.ts
@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="zh_CN"></TS>
--- a/frontend/mainwindow.ui
+++ b/frontend/mainwindow.ui
@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralwidget"/>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>800</width>
+     <height>25</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QStatusBar" name="statusbar"/>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>
--- a/frontend/release/base_widget.o
+++ b/frontend/release/base_widget.o
--- a/frontend/release/examSystem.exe
+++ b/frontend/release/examSystem.exe
--- a/frontend/release/examSystem_zh_CN.qm
+++ b/frontend/release/examSystem_zh_CN.qm
--- a/frontend/release/login_widget.o
+++ b/frontend/release/login_widget.o
--- a/frontend/release/loginwidget.o
+++ b/frontend/release/loginwidget.o
--- a/frontend/release/main.o
+++ b/frontend/release/main.o
--- a/frontend/release/main_window.o
+++ b/frontend/release/main_window.o
--- a/frontend/release/moc_base_widget.cpp
+++ b/frontend/release/moc_base_widget.cpp
@ -0,0 +1,115 @@
+/****************************************************************************
+** Meta object code from reading C++ file 'base_widget.h'
+**
+** Created by: The Qt Meta Object Compiler version 68 (Qt 6.5.3)
+**
+** WARNING! All changes made in this file will be lost!
+*****************************************************************************/
+
+#include "../src/base_widget.h"
+#include <QtCore/qmetatype.h>
+
+#if __has_include(<QtCore/qtmochelpers.h>)
+#include <QtCore/qtmochelpers.h>
+#else
+QT_BEGIN_MOC_NAMESPACE
+#endif
+
+
+#include <memory>
+
+#if !defined(Q_MOC_OUTPUT_REVISION)
+#error "The header file 'base_widget.h' doesn't include <QObject>."
+#elif Q_MOC_OUTPUT_REVISION != 68
+#error "This file was generated using the moc from 6.5.3. It"
+#error "cannot be used with the include files from this version of Qt."
+#error "(The moc has changed too much.)"
+#endif
+
+#ifndef Q_CONSTINIT
+#define Q_CONSTINIT
+#endif
+
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+QT_WARNING_DISABLE_GCC("-Wuseless-cast")
+namespace {
+
+#ifdef QT_MOC_HAS_STRINGDATA
+struct qt_meta_stringdata_CLASSBaseWidgetENDCLASS_t {};
+static constexpr auto qt_meta_stringdata_CLASSBaseWidgetENDCLASS = QtMocHelpers::stringData(
+    "BaseWidget"
+);
+#else  // !QT_MOC_HAS_STRING_DATA
+struct qt_meta_stringdata_CLASSBaseWidgetENDCLASS_t {
+    uint offsetsAndSizes[2];
+    char stringdata0[11];
+};
+#define QT_MOC_LITERAL(ofs, len) \
+    uint(sizeof(qt_meta_stringdata_CLASSBaseWidgetENDCLASS_t::offsetsAndSizes) + ofs), len 
+Q_CONSTINIT static const qt_meta_stringdata_CLASSBaseWidgetENDCLASS_t qt_meta_stringdata_CLASSBaseWidgetENDCLASS = {
+    {
+        QT_MOC_LITERAL(0, 10)   // "BaseWidget"
+    },
+    "BaseWidget"
+};
+#undef QT_MOC_LITERAL
+#endif // !QT_MOC_HAS_STRING_DATA
+} // unnamed namespace
+
+Q_CONSTINIT static const uint qt_meta_data_CLASSBaseWidgetENDCLASS[] = {
+
+ // content:
+      11,       // revision
+       0,       // classname
+       0,    0, // classinfo
+       0,    0, // methods
+       0,    0, // properties
+       0,    0, // enums/sets
+       0,    0, // constructors
+       0,       // flags
+       0,       // signalCount
+
+       0        // eod
+};
+
+Q_CONSTINIT const QMetaObject BaseWidget::staticMetaObject = { {
+    QMetaObject::SuperData::link<QWidget::staticMetaObject>(),
+    qt_meta_stringdata_CLASSBaseWidgetENDCLASS.offsetsAndSizes,
+    qt_meta_data_CLASSBaseWidgetENDCLASS,
+    qt_static_metacall,
+    nullptr,
+    qt_incomplete_metaTypeArray<qt_meta_stringdata_CLASSBaseWidgetENDCLASS_t,
+        // Q_OBJECT / Q_GADGET
+        QtPrivate::TypeAndForceComplete<BaseWidget, std::true_type>
+    >,
+    nullptr
+} };
+
+void BaseWidget::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
+{
+    (void)_o;
+    (void)_id;
+    (void)_c;
+    (void)_a;
+}
+
+const QMetaObject *BaseWidget::metaObject() const
+{
+    return QObject::d_ptr->metaObject ? QObject::d_ptr->dynamicMetaObject() : &staticMetaObject;
+}
+
+void *BaseWidget::qt_metacast(const char *_clname)
+{
+    if (!_clname) return nullptr;
+    if (!strcmp(_clname, qt_meta_stringdata_CLASSBaseWidgetENDCLASS.stringdata0))
+        return static_cast<void*>(this);
+    return QWidget::qt_metacast(_clname);
+}
+
+int BaseWidget::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
+{
+    _id = QWidget::qt_metacall(_c, _id, _a);
+    return _id;
+}
+QT_WARNING_POP
--- a/frontend/release/moc_base_widget.o
+++ b/frontend/release/moc_base_widget.o
--- a/frontend/release/moc_login_widget.cpp
+++ b/frontend/release/moc_login_widget.cpp
@ -0,0 +1,234 @@
+/****************************************************************************
+** Meta object code from reading C++ file 'login_widget.h'
+**
+** Created by: The Qt Meta Object Compiler version 68 (Qt 6.5.3)
+**
+** WARNING! All changes made in this file will be lost!
+*****************************************************************************/
+
+#include "../src/login_widget.h"
+#include <QtGui/qtextcursor.h>
+#include <QtCore/qmetatype.h>
+
+#if __has_include(<QtCore/qtmochelpers.h>)
+#include <QtCore/qtmochelpers.h>
+#else
+QT_BEGIN_MOC_NAMESPACE
+#endif
+
+
+#include <memory>
+
+#if !defined(Q_MOC_OUTPUT_REVISION)
+#error "The header file 'login_widget.h' doesn't include <QObject>."
+#elif Q_MOC_OUTPUT_REVISION != 68
+#error "This file was generated using the moc from 6.5.3. It"
+#error "cannot be used with the include files from this version of Qt."
+#error "(The moc has changed too much.)"
+#endif
+
+#ifndef Q_CONSTINIT
+#define Q_CONSTINIT
+#endif
+
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+QT_WARNING_DISABLE_GCC("-Wuseless-cast")
+namespace {
+
+#ifdef QT_MOC_HAS_STRINGDATA
+struct qt_meta_stringdata_CLASSLoginWidgetENDCLASS_t {};
+static constexpr auto qt_meta_stringdata_CLASSLoginWidgetENDCLASS = QtMocHelpers::stringData(
+    "LoginWidget",
+    "loginSuccess",
+    "",
+    "registerSuccess",
+    "onLoginClicked",
+    "showRegisterPage",
+    "showLoginPage",
+    "onRegisterClicked",
+    "onSendCodeClicked"
+);
+#else  // !QT_MOC_HAS_STRING_DATA
+struct qt_meta_stringdata_CLASSLoginWidgetENDCLASS_t {
+    uint offsetsAndSizes[18];
+    char stringdata0[12];
+    char stringdata1[13];
+    char stringdata2[1];
+    char stringdata3[16];
+    char stringdata4[15];
+    char stringdata5[17];
+    char stringdata6[14];
+    char stringdata7[18];
+    char stringdata8[18];
+};
+#define QT_MOC_LITERAL(ofs, len) \
+    uint(sizeof(qt_meta_stringdata_CLASSLoginWidgetENDCLASS_t::offsetsAndSizes) + ofs), len 
+Q_CONSTINIT static const qt_meta_stringdata_CLASSLoginWidgetENDCLASS_t qt_meta_stringdata_CLASSLoginWidgetENDCLASS = {
+    {
+        QT_MOC_LITERAL(0, 11),  // "LoginWidget"
+        QT_MOC_LITERAL(12, 12),  // "loginSuccess"
+        QT_MOC_LITERAL(25, 0),  // ""
+        QT_MOC_LITERAL(26, 15),  // "registerSuccess"
+        QT_MOC_LITERAL(42, 14),  // "onLoginClicked"
+        QT_MOC_LITERAL(57, 16),  // "showRegisterPage"
+        QT_MOC_LITERAL(74, 13),  // "showLoginPage"
+        QT_MOC_LITERAL(88, 17),  // "onRegisterClicked"
+        QT_MOC_LITERAL(106, 17)   // "onSendCodeClicked"
+    },
+    "LoginWidget",
+    "loginSuccess",
+    "",
+    "registerSuccess",
+    "onLoginClicked",
+    "showRegisterPage",
+    "showLoginPage",
+    "onRegisterClicked",
+    "onSendCodeClicked"
+};
+#undef QT_MOC_LITERAL
+#endif // !QT_MOC_HAS_STRING_DATA
+} // unnamed namespace
+
+Q_CONSTINIT static const uint qt_meta_data_CLASSLoginWidgetENDCLASS[] = {
+
+ // content:
+      11,       // revision
+       0,       // classname
+       0,    0, // classinfo
+       7,   14, // methods
+       0,    0, // properties
+       0,    0, // enums/sets
+       0,    0, // constructors
+       0,       // flags
+       2,       // signalCount
+
+ // signals: name, argc, parameters, tag, flags, initial metatype offsets
+       1,    0,   56,    2, 0x06,    1 /* Public */,
+       3,    0,   57,    2, 0x06,    2 /* Public */,
+
+ // slots: name, argc, parameters, tag, flags, initial metatype offsets
+       4,    0,   58,    2, 0x08,    3 /* Private */,
+       5,    0,   59,    2, 0x08,    4 /* Private */,
+       6,    0,   60,    2, 0x08,    5 /* Private */,
+       7,    0,   61,    2, 0x08,    6 /* Private */,
+       8,    0,   62,    2, 0x08,    7 /* Private */,
+
+ // signals: parameters
+    QMetaType::Void,
+    QMetaType::Void,
+
+ // slots: parameters
+    QMetaType::Void,
+    QMetaType::Void,
+    QMetaType::Void,
+    QMetaType::Void,
+    QMetaType::Void,
+
+       0        // eod
+};
+
+Q_CONSTINIT const QMetaObject LoginWidget::staticMetaObject = { {
+    QMetaObject::SuperData::link<BaseWidget::staticMetaObject>(),
+    qt_meta_stringdata_CLASSLoginWidgetENDCLASS.offsetsAndSizes,
+    qt_meta_data_CLASSLoginWidgetENDCLASS,
+    qt_static_metacall,
+    nullptr,
+    qt_incomplete_metaTypeArray<qt_meta_stringdata_CLASSLoginWidgetENDCLASS_t,
+        // Q_OBJECT / Q_GADGET
+        QtPrivate::TypeAndForceComplete<LoginWidget, std::true_type>,
+        // method 'loginSuccess'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'registerSuccess'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'onLoginClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'showRegisterPage'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'showLoginPage'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'onRegisterClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'onSendCodeClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>
+    >,
+    nullptr
+} };
+
+void LoginWidget::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
+{
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        auto *_t = static_cast<LoginWidget *>(_o);
+        (void)_t;
+        switch (_id) {
+        case 0: _t->loginSuccess(); break;
+        case 1: _t->registerSuccess(); break;
+        case 2: _t->onLoginClicked(); break;
+        case 3: _t->showRegisterPage(); break;
+        case 4: _t->showLoginPage(); break;
+        case 5: _t->onRegisterClicked(); break;
+        case 6: _t->onSendCodeClicked(); break;
+        default: ;
+        }
+    } else if (_c == QMetaObject::IndexOfMethod) {
+        int *result = reinterpret_cast<int *>(_a[0]);
+        {
+            using _t = void (LoginWidget::*)();
+            if (_t _q_method = &LoginWidget::loginSuccess; *reinterpret_cast<_t *>(_a[1]) == _q_method) {
+                *result = 0;
+                return;
+            }
+        }
+        {
+            using _t = void (LoginWidget::*)();
+            if (_t _q_method = &LoginWidget::registerSuccess; *reinterpret_cast<_t *>(_a[1]) == _q_method) {
+                *result = 1;
+                return;
+            }
+        }
+    }
+    (void)_a;
+}
+
+const QMetaObject *LoginWidget::metaObject() const
+{
+    return QObject::d_ptr->metaObject ? QObject::d_ptr->dynamicMetaObject() : &staticMetaObject;
+}
+
+void *LoginWidget::qt_metacast(const char *_clname)
+{
+    if (!_clname) return nullptr;
+    if (!strcmp(_clname, qt_meta_stringdata_CLASSLoginWidgetENDCLASS.stringdata0))
+        return static_cast<void*>(this);
+    return BaseWidget::qt_metacast(_clname);
+}
+
+int LoginWidget::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
+{
+    _id = BaseWidget::qt_metacall(_c, _id, _a);
+    if (_id < 0)
+        return _id;
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        if (_id < 7)
+            qt_static_metacall(this, _c, _id, _a);
+        _id -= 7;
+    } else if (_c == QMetaObject::RegisterMethodArgumentMetaType) {
+        if (_id < 7)
+            *reinterpret_cast<QMetaType *>(_a[0]) = QMetaType();
+        _id -= 7;
+    }
+    return _id;
+}
+
+// SIGNAL 0
+void LoginWidget::loginSuccess()
+{
+    QMetaObject::activate(this, &staticMetaObject, 0, nullptr);
+}
+
+// SIGNAL 1
+void LoginWidget::registerSuccess()
+{
+    QMetaObject::activate(this, &staticMetaObject, 1, nullptr);
+}
+QT_WARNING_POP
--- a/frontend/release/moc_login_widget.o
+++ b/frontend/release/moc_login_widget.o
--- a/frontend/release/moc_loginwidget.cpp
+++ b/frontend/release/moc_loginwidget.cpp
@ -0,0 +1,234 @@
+/****************************************************************************
+** Meta object code from reading C++ file 'loginwidget.h'
+**
+** Created by: The Qt Meta Object Compiler version 68 (Qt 6.5.3)
+**
+** WARNING! All changes made in this file will be lost!
+*****************************************************************************/
+
+#include "../src/loginwidget.h"
+#include <QtGui/qtextcursor.h>
+#include <QtCore/qmetatype.h>
+
+#if __has_include(<QtCore/qtmochelpers.h>)
+#include <QtCore/qtmochelpers.h>
+#else
+QT_BEGIN_MOC_NAMESPACE
+#endif
+
+
+#include <memory>
+
+#if !defined(Q_MOC_OUTPUT_REVISION)
+#error "The header file 'loginwidget.h' doesn't include <QObject>."
+#elif Q_MOC_OUTPUT_REVISION != 68
+#error "This file was generated using the moc from 6.5.3. It"
+#error "cannot be used with the include files from this version of Qt."
+#error "(The moc has changed too much.)"
+#endif
+
+#ifndef Q_CONSTINIT
+#define Q_CONSTINIT
+#endif
+
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+QT_WARNING_DISABLE_GCC("-Wuseless-cast")
+namespace {
+
+#ifdef QT_MOC_HAS_STRINGDATA
+struct qt_meta_stringdata_CLASSLoginWidgetENDCLASS_t {};
+static constexpr auto qt_meta_stringdata_CLASSLoginWidgetENDCLASS = QtMocHelpers::stringData(
+    "LoginWidget",
+    "loginSuccess",
+    "",
+    "registerSuccess",
+    "onLoginClicked",
+    "showRegisterPage",
+    "showLoginPage",
+    "onRegisterClicked",
+    "onSendCodeClicked"
+);
+#else  // !QT_MOC_HAS_STRING_DATA
+struct qt_meta_stringdata_CLASSLoginWidgetENDCLASS_t {
+    uint offsetsAndSizes[18];
+    char stringdata0[12];
+    char stringdata1[13];
+    char stringdata2[1];
+    char stringdata3[16];
+    char stringdata4[15];
+    char stringdata5[17];
+    char stringdata6[14];
+    char stringdata7[18];
+    char stringdata8[18];
+};
+#define QT_MOC_LITERAL(ofs, len) \
+    uint(sizeof(qt_meta_stringdata_CLASSLoginWidgetENDCLASS_t::offsetsAndSizes) + ofs), len 
+Q_CONSTINIT static const qt_meta_stringdata_CLASSLoginWidgetENDCLASS_t qt_meta_stringdata_CLASSLoginWidgetENDCLASS = {
+    {
+        QT_MOC_LITERAL(0, 11),  // "LoginWidget"
+        QT_MOC_LITERAL(12, 12),  // "loginSuccess"
+        QT_MOC_LITERAL(25, 0),  // ""
+        QT_MOC_LITERAL(26, 15),  // "registerSuccess"
+        QT_MOC_LITERAL(42, 14),  // "onLoginClicked"
+        QT_MOC_LITERAL(57, 16),  // "showRegisterPage"
+        QT_MOC_LITERAL(74, 13),  // "showLoginPage"
+        QT_MOC_LITERAL(88, 17),  // "onRegisterClicked"
+        QT_MOC_LITERAL(106, 17)   // "onSendCodeClicked"
+    },
+    "LoginWidget",
+    "loginSuccess",
+    "",
+    "registerSuccess",
+    "onLoginClicked",
+    "showRegisterPage",
+    "showLoginPage",
+    "onRegisterClicked",
+    "onSendCodeClicked"
+};
+#undef QT_MOC_LITERAL
+#endif // !QT_MOC_HAS_STRING_DATA
+} // unnamed namespace
+
+Q_CONSTINIT static const uint qt_meta_data_CLASSLoginWidgetENDCLASS[] = {
+
+ // content:
+      11,       // revision
+       0,       // classname
+       0,    0, // classinfo
+       7,   14, // methods
+       0,    0, // properties
+       0,    0, // enums/sets
+       0,    0, // constructors
+       0,       // flags
+       2,       // signalCount
+
+ // signals: name, argc, parameters, tag, flags, initial metatype offsets
+       1,    0,   56,    2, 0x06,    1 /* Public */,
+       3,    0,   57,    2, 0x06,    2 /* Public */,
+
+ // slots: name, argc, parameters, tag, flags, initial metatype offsets
+       4,    0,   58,    2, 0x08,    3 /* Private */,
+       5,    0,   59,    2, 0x08,    4 /* Private */,
+       6,    0,   60,    2, 0x08,    5 /* Private */,
+       7,    0,   61,    2, 0x08,    6 /* Private */,
+       8,    0,   62,    2, 0x08,    7 /* Private */,
+
+ // signals: parameters
+    QMetaType::Void,
+    QMetaType::Void,
+
+ // slots: parameters
+    QMetaType::Void,
+    QMetaType::Void,
+    QMetaType::Void,
+    QMetaType::Void,
+    QMetaType::Void,
+
+       0        // eod
+};
+
+Q_CONSTINIT const QMetaObject LoginWidget::staticMetaObject = { {
+    QMetaObject::SuperData::link<QWidget::staticMetaObject>(),
+    qt_meta_stringdata_CLASSLoginWidgetENDCLASS.offsetsAndSizes,
+    qt_meta_data_CLASSLoginWidgetENDCLASS,
+    qt_static_metacall,
+    nullptr,
+    qt_incomplete_metaTypeArray<qt_meta_stringdata_CLASSLoginWidgetENDCLASS_t,
+        // Q_OBJECT / Q_GADGET
+        QtPrivate::TypeAndForceComplete<LoginWidget, std::true_type>,
+        // method 'loginSuccess'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'registerSuccess'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'onLoginClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'showRegisterPage'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'showLoginPage'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'onRegisterClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'onSendCodeClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>
+    >,
+    nullptr
+} };
+
+void LoginWidget::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
+{
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        auto *_t = static_cast<LoginWidget *>(_o);
+        (void)_t;
+        switch (_id) {
+        case 0: _t->loginSuccess(); break;
+        case 1: _t->registerSuccess(); break;
+        case 2: _t->onLoginClicked(); break;
+        case 3: _t->showRegisterPage(); break;
+        case 4: _t->showLoginPage(); break;
+        case 5: _t->onRegisterClicked(); break;
+        case 6: _t->onSendCodeClicked(); break;
+        default: ;
+        }
+    } else if (_c == QMetaObject::IndexOfMethod) {
+        int *result = reinterpret_cast<int *>(_a[0]);
+        {
+            using _t = void (LoginWidget::*)();
+            if (_t _q_method = &LoginWidget::loginSuccess; *reinterpret_cast<_t *>(_a[1]) == _q_method) {
+                *result = 0;
+                return;
+            }
+        }
+        {
+            using _t = void (LoginWidget::*)();
+            if (_t _q_method = &LoginWidget::registerSuccess; *reinterpret_cast<_t *>(_a[1]) == _q_method) {
+                *result = 1;
+                return;
+            }
+        }
+    }
+    (void)_a;
+}
+
+const QMetaObject *LoginWidget::metaObject() const
+{
+    return QObject::d_ptr->metaObject ? QObject::d_ptr->dynamicMetaObject() : &staticMetaObject;
+}
+
+void *LoginWidget::qt_metacast(const char *_clname)
+{
+    if (!_clname) return nullptr;
+    if (!strcmp(_clname, qt_meta_stringdata_CLASSLoginWidgetENDCLASS.stringdata0))
+        return static_cast<void*>(this);
+    return QWidget::qt_metacast(_clname);
+}
+
+int LoginWidget::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
+{
+    _id = QWidget::qt_metacall(_c, _id, _a);
+    if (_id < 0)
+        return _id;
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        if (_id < 7)
+            qt_static_metacall(this, _c, _id, _a);
+        _id -= 7;
+    } else if (_c == QMetaObject::RegisterMethodArgumentMetaType) {
+        if (_id < 7)
+            *reinterpret_cast<QMetaType *>(_a[0]) = QMetaType();
+        _id -= 7;
+    }
+    return _id;
+}
+
+// SIGNAL 0
+void LoginWidget::loginSuccess()
+{
+    QMetaObject::activate(this, &staticMetaObject, 0, nullptr);
+}
+
+// SIGNAL 1
+void LoginWidget::registerSuccess()
+{
+    QMetaObject::activate(this, &staticMetaObject, 1, nullptr);
+}
+QT_WARNING_POP
--- a/frontend/release/moc_loginwidget.o
+++ b/frontend/release/moc_loginwidget.o
--- a/frontend/release/moc_main_window.cpp
+++ b/frontend/release/moc_main_window.cpp
@ -0,0 +1,193 @@
+/****************************************************************************
+** Meta object code from reading C++ file 'main_window.h'
+**
+** Created by: The Qt Meta Object Compiler version 68 (Qt 6.5.3)
+**
+** WARNING! All changes made in this file will be lost!
+*****************************************************************************/
+
+#include "../src/main_window.h"
+#include <QtGui/qtextcursor.h>
+#include <QtCore/qmetatype.h>
+
+#if __has_include(<QtCore/qtmochelpers.h>)
+#include <QtCore/qtmochelpers.h>
+#else
+QT_BEGIN_MOC_NAMESPACE
+#endif
+
+
+#include <memory>
+
+#if !defined(Q_MOC_OUTPUT_REVISION)
+#error "The header file 'main_window.h' doesn't include <QObject>."
+#elif Q_MOC_OUTPUT_REVISION != 68
+#error "This file was generated using the moc from 6.5.3. It"
+#error "cannot be used with the include files from this version of Qt."
+#error "(The moc has changed too much.)"
+#endif
+
+#ifndef Q_CONSTINIT
+#define Q_CONSTINIT
+#endif
+
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+QT_WARNING_DISABLE_GCC("-Wuseless-cast")
+namespace {
+
+#ifdef QT_MOC_HAS_STRINGDATA
+struct qt_meta_stringdata_CLASSMainWindowENDCLASS_t {};
+static constexpr auto qt_meta_stringdata_CLASSMainWindowENDCLASS = QtMocHelpers::stringData(
+    "MainWindow",
+    "showSelection",
+    "",
+    "showQuestions",
+    "difficulty",
+    "count",
+    "showResult",
+    "TestResult",
+    "result",
+    "restartFromResult"
+);
+#else  // !QT_MOC_HAS_STRING_DATA
+struct qt_meta_stringdata_CLASSMainWindowENDCLASS_t {
+    uint offsetsAndSizes[20];
+    char stringdata0[11];
+    char stringdata1[14];
+    char stringdata2[1];
+    char stringdata3[14];
+    char stringdata4[11];
+    char stringdata5[6];
+    char stringdata6[11];
+    char stringdata7[11];
+    char stringdata8[7];
+    char stringdata9[18];
+};
+#define QT_MOC_LITERAL(ofs, len) \
+    uint(sizeof(qt_meta_stringdata_CLASSMainWindowENDCLASS_t::offsetsAndSizes) + ofs), len 
+Q_CONSTINIT static const qt_meta_stringdata_CLASSMainWindowENDCLASS_t qt_meta_stringdata_CLASSMainWindowENDCLASS = {
+    {
+        QT_MOC_LITERAL(0, 10),  // "MainWindow"
+        QT_MOC_LITERAL(11, 13),  // "showSelection"
+        QT_MOC_LITERAL(25, 0),  // ""
+        QT_MOC_LITERAL(26, 13),  // "showQuestions"
+        QT_MOC_LITERAL(40, 10),  // "difficulty"
+        QT_MOC_LITERAL(51, 5),  // "count"
+        QT_MOC_LITERAL(57, 10),  // "showResult"
+        QT_MOC_LITERAL(68, 10),  // "TestResult"
+        QT_MOC_LITERAL(79, 6),  // "result"
+        QT_MOC_LITERAL(86, 17)   // "restartFromResult"
+    },
+    "MainWindow",
+    "showSelection",
+    "",
+    "showQuestions",
+    "difficulty",
+    "count",
+    "showResult",
+    "TestResult",
+    "result",
+    "restartFromResult"
+};
+#undef QT_MOC_LITERAL
+#endif // !QT_MOC_HAS_STRING_DATA
+} // unnamed namespace
+
+Q_CONSTINIT static const uint qt_meta_data_CLASSMainWindowENDCLASS[] = {
+
+ // content:
+      11,       // revision
+       0,       // classname
+       0,    0, // classinfo
+       4,   14, // methods
+       0,    0, // properties
+       0,    0, // enums/sets
+       0,    0, // constructors
+       0,       // flags
+       0,       // signalCount
+
+ // slots: name, argc, parameters, tag, flags, initial metatype offsets
+       1,    0,   38,    2, 0x08,    1 /* Private */,
+       3,    2,   39,    2, 0x08,    2 /* Private */,
+       6,    1,   44,    2, 0x08,    5 /* Private */,
+       9,    0,   47,    2, 0x08,    7 /* Private */,
+
+ // slots: parameters
+    QMetaType::Void,
+    QMetaType::Void, QMetaType::QString, QMetaType::Int,    4,    5,
+    QMetaType::Void, 0x80000000 | 7,    8,
+    QMetaType::Void,
+
+       0        // eod
+};
+
+Q_CONSTINIT const QMetaObject MainWindow::staticMetaObject = { {
+    QMetaObject::SuperData::link<QMainWindow::staticMetaObject>(),
+    qt_meta_stringdata_CLASSMainWindowENDCLASS.offsetsAndSizes,
+    qt_meta_data_CLASSMainWindowENDCLASS,
+    qt_static_metacall,
+    nullptr,
+    qt_incomplete_metaTypeArray<qt_meta_stringdata_CLASSMainWindowENDCLASS_t,
+        // Q_OBJECT / Q_GADGET
+        QtPrivate::TypeAndForceComplete<MainWindow, std::true_type>,
+        // method 'showSelection'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'showQuestions'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        QtPrivate::TypeAndForceComplete<const QString &, std::false_type>,
+        QtPrivate::TypeAndForceComplete<int, std::false_type>,
+        // method 'showResult'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        QtPrivate::TypeAndForceComplete<const TestResult &, std::false_type>,
+        // method 'restartFromResult'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>
+    >,
+    nullptr
+} };
+
+void MainWindow::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
+{
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        auto *_t = static_cast<MainWindow *>(_o);
+        (void)_t;
+        switch (_id) {
+        case 0: _t->showSelection(); break;
+        case 1: _t->showQuestions((*reinterpret_cast< std::add_pointer_t<QString>>(_a[1])),(*reinterpret_cast< std::add_pointer_t<int>>(_a[2]))); break;
+        case 2: _t->showResult((*reinterpret_cast< std::add_pointer_t<TestResult>>(_a[1]))); break;
+        case 3: _t->restartFromResult(); break;
+        default: ;
+        }
+    }
+}
+
+const QMetaObject *MainWindow::metaObject() const
+{
+    return QObject::d_ptr->metaObject ? QObject::d_ptr->dynamicMetaObject() : &staticMetaObject;
+}
+
+void *MainWindow::qt_metacast(const char *_clname)
+{
+    if (!_clname) return nullptr;
+    if (!strcmp(_clname, qt_meta_stringdata_CLASSMainWindowENDCLASS.stringdata0))
+        return static_cast<void*>(this);
+    return QMainWindow::qt_metacast(_clname);
+}
+
+int MainWindow::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
+{
+    _id = QMainWindow::qt_metacall(_c, _id, _a);
+    if (_id < 0)
+        return _id;
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        if (_id < 4)
+            qt_static_metacall(this, _c, _id, _a);
+        _id -= 4;
+    } else if (_c == QMetaObject::RegisterMethodArgumentMetaType) {
+        if (_id < 4)
+            *reinterpret_cast<QMetaType *>(_a[0]) = QMetaType();
+        _id -= 4;
+    }
+    return _id;
+}
+QT_WARNING_POP
--- a/frontend/release/moc_main_window.o
+++ b/frontend/release/moc_main_window.o
--- a/frontend/release/moc_predefs.h
+++ b/frontend/release/moc_predefs.h
@ -0,0 +1,439 @@
+#define __DBL_MIN_EXP__ (-1021)
+#define __cpp_attributes 200809L
+#define __cpp_nontype_template_parameter_auto 201606L
+#define __UINT_LEAST16_MAX__ 0xffff
+#define __ATOMIC_ACQUIRE 2
+#define __FLT128_MAX_10_EXP__ 4932
+#define __FLT_MIN__ 1.17549435082228750796873653722224568e-38F
+#define __GCC_IEC_559_COMPLEX 2
+#define __cpp_aggregate_nsdmi 201304L
+#define __UINT_LEAST8_TYPE__ unsigned char
+#define __SIZEOF_FLOAT80__ 16
+#define __INTMAX_C(c) c ## LL
+#define __CHAR_BIT__ 8
+#define __MINGW32__ 1
+#define __UINT8_MAX__ 0xff
+#define __SCHAR_WIDTH__ 8
+#define _WIN64 1
+#define __WINT_MAX__ 0xffff
+#define __FLT32_MIN_EXP__ (-125)
+#define __cpp_static_assert 201411L
+#define __ORDER_LITTLE_ENDIAN__ 1234
+#define __SIZE_MAX__ 0xffffffffffffffffULL
+#define __WCHAR_MAX__ 0xffff
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
+#define __DBL_DENORM_MIN__ double(4.94065645841246544176568792868221372e-324L)
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1
+#define __GCC_ATOMIC_CHAR_LOCK_FREE 2
+#define __GCC_IEC_559 2
+#define __FLT32X_DECIMAL_DIG__ 17
+#define __FLT_EVAL_METHOD__ 0
+#define __cpp_binary_literals 201304L
+#define __FLT64_DECIMAL_DIG__ 17
+#define __cpp_noexcept_function_type 201510L
+#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2
+#define __cpp_variadic_templates 200704L
+#define __UINT_FAST64_MAX__ 0xffffffffffffffffULL
+#define __SIG_ATOMIC_TYPE__ int
+#define __DBL_MIN_10_EXP__ (-307)
+#define __FINITE_MATH_ONLY__ 0
+#define __cpp_variable_templates 201304L
+#define __FLT32X_MAX_EXP__ 1024
+#define __FLT32_HAS_DENORM__ 1
+#define __UINT_FAST8_MAX__ 0xff
+#define __cpp_rvalue_reference 200610L
+#define __cpp_nested_namespace_definitions 201411L
+#define _stdcall __attribute__((__stdcall__))
+#define __DEC64_MAX_EXP__ 385
+#define __INT8_C(c) c
+#define __INT_LEAST8_WIDTH__ 8
+#define __cpp_variadic_using 201611L
+#define __UINT_LEAST64_MAX__ 0xffffffffffffffffULL
+#define __INT_LEAST8_MAX__ 0x7f
+#define __cpp_capture_star_this 201603L
+#define __SHRT_MAX__ 0x7fff
+#define __LDBL_MAX__ 1.18973149535723176502126385303097021e+4932L
+#define __FLT64X_MAX_10_EXP__ 4932
+#define __cpp_if_constexpr 201606L
+#define __LDBL_IS_IEC_60559__ 2
+#define __FLT64X_HAS_QUIET_NAN__ 1
+#define __UINT_LEAST8_MAX__ 0xff
+#define __GCC_ATOMIC_BOOL_LOCK_FREE 2
+#define __FLT128_DENORM_MIN__ 6.47517511943802511092443895822764655e-4966F128
+#define __UINTMAX_TYPE__ long long unsigned int
+#define __DEC32_EPSILON__ 1E-6DF
+#define __FLT_EVAL_METHOD_TS_18661_3__ 0
+#define __OPTIMIZE__ 1
+#define __UINT32_MAX__ 0xffffffffU
+#define __GXX_EXPERIMENTAL_CXX0X__ 1
+#define __FLT128_MIN_EXP__ (-16381)
+#define __WINT_MIN__ 0
+#define __FLT128_MIN_10_EXP__ (-4931)
+#define __FLT32X_IS_IEC_60559__ 2
+#define __INT_LEAST16_WIDTH__ 16
+#define __SCHAR_MAX__ 0x7f
+#define __FLT128_MANT_DIG__ 113
+#define __WCHAR_MIN__ 0
+#define __INT64_C(c) c ## LL
+#define __GCC_ATOMIC_POINTER_LOCK_FREE 2
+#define __FLT32X_MANT_DIG__ 53
+#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2
+#define __cpp_aligned_new 201606L
+#define __USER_LABEL_PREFIX__ 
+#define __FLT32_MAX_10_EXP__ 38
+#define __FLT64X_EPSILON__ 1.08420217248550443400745280086994171e-19F64x
+#define __STDC_HOSTED__ 1
+#define __DEC64_MIN_EXP__ (-382)
+#define __WIN64 1
+#define __cpp_decltype_auto 201304L
+#define __DBL_DIG__ 15
+#define __FLT32_DIG__ 6
+#define __FLT_EPSILON__ 1.19209289550781250000000000000000000e-7F
+#define __GXX_WEAK__ 1
+#define __SHRT_WIDTH__ 16
+#define __FLT32_IS_IEC_60559__ 2
+#define __LDBL_MIN__ 3.36210314311209350626267781732175260e-4932L
+#define __DBL_IS_IEC_60559__ 2
+#define __DEC32_MAX__ 9.999999E96DF
+#define __cpp_threadsafe_static_init 200806L
+#define __cpp_enumerator_attributes 201411L
+#define __FLT64X_DENORM_MIN__ 3.64519953188247460252840593361941982e-4951F64x
+#define __FLT32X_HAS_INFINITY__ 1
+#define __INT32_MAX__ 0x7fffffff
+#define __INT_WIDTH__ 32
+#define __SIZEOF_LONG__ 4
+#define __UINT16_C(c) c
+#define __DECIMAL_DIG__ 21
+#define __FLT64_EPSILON__ 2.22044604925031308084726333618164062e-16F64
+#define __INT16_MAX__ 0x7fff
+#define __FLT64_MIN_EXP__ (-1021)
+#define __FLT64X_MIN_10_EXP__ (-4931)
+#define __LDBL_HAS_QUIET_NAN__ 1
+#define __FLT64_MANT_DIG__ 53
+#define _REENTRANT 1
+#define __FLT64X_MANT_DIG__ 64
+#define __GNUC__ 11
+#define _cdecl __attribute__((__cdecl__))
+#define __GXX_RTTI 1
+#define __MMX__ 1
+#define __FLT_HAS_DENORM__ 1
+#define __SIZEOF_LONG_DOUBLE__ 16
+#define __BIGGEST_ALIGNMENT__ 16
+#define __STDC_UTF_16__ 1
+#define __FLT64_MAX_10_EXP__ 308
+#define __cpp_delegating_constructors 200604L
+#define __FLT32_HAS_INFINITY__ 1
+#define __DBL_MAX__ double(1.79769313486231570814527423731704357e+308L)
+#define _thiscall __attribute__((__thiscall__))
+#define __cpp_raw_strings 200710L
+#define __INT_FAST32_MAX__ 0x7fffffff
+#define __WINNT 1
+#define __DBL_HAS_INFINITY__ 1
+#define __SIZEOF_FLOAT__ 4
+#define __WINNT__ 1
+#define __HAVE_SPECULATION_SAFE_VALUE 1
+#define __cpp_fold_expressions 201603L
+#define __DEC32_MIN_EXP__ (-94)
+#define __INTPTR_WIDTH__ 64
+#define __FLT64X_HAS_INFINITY__ 1
+#define __UINT_LEAST32_MAX__ 0xffffffffU
+#define __FLT32X_HAS_DENORM__ 1
+#define __INT_FAST16_TYPE__ short int
+#define __MMX_WITH_SSE__ 1
+#define _fastcall __attribute__((__fastcall__))
+#define __LDBL_HAS_DENORM__ 1
+#define __cplusplus 201703L
+#define __cpp_ref_qualifiers 200710L
+#define __DEC32_MIN__ 1E-95DF
+#define __DEPRECATED 1
+#define __cpp_rvalue_references 200610L
+#define __DBL_MAX_EXP__ 1024
+#define __WCHAR_WIDTH__ 16
+#define __FLT32_MAX__ 3.40282346638528859811704183484516925e+38F32
+#define __DEC128_EPSILON__ 1E-33DL
+#define __SSE2_MATH__ 1
+#define __ATOMIC_HLE_RELEASE 131072
+#define __WIN32__ 1
+#define __PTRDIFF_MAX__ 0x7fffffffffffffffLL
+#define __amd64 1
+#define __tune_core2__ 1
+#define __ATOMIC_HLE_ACQUIRE 65536
+#define __GNUG__ 11
+#define __LONG_LONG_MAX__ 0x7fffffffffffffffLL
+#define __SIZEOF_SIZE_T__ 8
+#define __cpp_nsdmi 200809L
+#define __FLT64X_MIN_EXP__ (-16381)
+#define __SIZEOF_WINT_T__ 2
+#define __LONG_LONG_WIDTH__ 64
+#define __cpp_initializer_lists 200806L
+#define __FLT32_MAX_EXP__ 128
+#define __cpp_hex_float 201603L
+#define __GXX_ABI_VERSION 1016
+#define __FLT128_HAS_INFINITY__ 1
+#define __FLT_MIN_EXP__ (-125)
+#define __x86_64 1
+#define __cpp_lambdas 200907L
+#define __INT_FAST64_TYPE__ long long int
+#define __FLT64_DENORM_MIN__ 4.94065645841246544176568792868221372e-324F64
+#define __cpp_template_auto 201606L
+#define __DBL_MIN__ double(2.22507385850720138309023271733240406e-308L)
+#define __FLT128_EPSILON__ 1.92592994438723585305597794258492732e-34F128
+#define __FLT64X_NORM_MAX__ 1.18973149535723176502126385303097021e+4932F64x
+#define __SIZEOF_POINTER__ 8
+#define __SIZE_TYPE__ long long unsigned int
+#define __DBL_HAS_QUIET_NAN__ 1
+#define __FLT32X_EPSILON__ 2.22044604925031308084726333618164062e-16F32x
+#define __DECIMAL_BID_FORMAT__ 1
+#define __GXX_TYPEINFO_EQUALITY_INLINE 0
+#define __FLT64_MIN_10_EXP__ (-307)
+#define __FLT64X_DECIMAL_DIG__ 21
+#define __DEC128_MIN__ 1E-6143DL
+#define __REGISTER_PREFIX__ 
+#define __UINT16_MAX__ 0xffff
+#define __cdecl __attribute__((__cdecl__))
+#define __LDBL_HAS_INFINITY__ 1
+#define __FLT32_MIN__ 1.17549435082228750796873653722224568e-38F32
+#define __UINT8_TYPE__ unsigned char
+#define __FLT_DIG__ 6
+#define __DEC_EVAL_METHOD__ 2
+#define __DEC128_MAX__ 9.999999999999999999999999999999999E6144DL
+#define __FLT_MANT_DIG__ 24
+#define __LDBL_DECIMAL_DIG__ 21
+#define __VERSION__ "11.2.0"
+#define __UINT64_C(c) c ## ULL
+#define __cpp_unicode_characters 201411L
+#define _WIN32 1
+#define __SEH__ 1
+#define __INT_LEAST32_MAX__ 0x7fffffff
+#define __GCC_ATOMIC_INT_LOCK_FREE 2
+#define __FLT128_MAX_EXP__ 16384
+#define __FLT32_MANT_DIG__ 24
+#define __FLOAT_WORD_ORDER__ __ORDER_LITTLE_ENDIAN__
+#define __cpp_aggregate_bases 201603L
+#define __FLT128_HAS_DENORM__ 1
+#define __FLT32_DECIMAL_DIG__ 9
+#define __FLT128_DIG__ 33
+#define __INT32_C(c) c
+#define __DEC64_EPSILON__ 1E-15DD
+#define __ORDER_PDP_ENDIAN__ 3412
+#define __DEC128_MIN_EXP__ (-6142)
+#define __INT_FAST32_TYPE__ int
+#define __UINT_LEAST16_TYPE__ short unsigned int
+#define __DBL_HAS_DENORM__ 1
+#define __cpp_rtti 199711L
+#define __UINT64_MAX__ 0xffffffffffffffffULL
+#define __FLT_IS_IEC_60559__ 2
+#define __GNUC_WIDE_EXECUTION_CHARSET_NAME "UTF-16LE"
+#define __FLT64X_DIG__ 18
+#define __INT8_TYPE__ signed char
+#define __cpp_digit_separators 201309L
+#define __GCC_ASM_FLAG_OUTPUTS__ 1
+#define __UINT32_TYPE__ unsigned int
+#define __FLT_RADIX__ 2
+#define __INT_LEAST16_TYPE__ short int
+#define __LDBL_EPSILON__ 1.08420217248550443400745280086994171e-19L
+#define __UINTMAX_C(c) c ## ULL
+#define __GLIBCXX_BITSIZE_INT_N_0 128
+#define __FLT32X_MIN__ 2.22507385850720138309023271733240406e-308F32x
+#define __SIG_ATOMIC_MAX__ 0x7fffffff
+#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 2
+#define __SIZEOF_PTRDIFF_T__ 8
+#define __LDBL_DIG__ 18
+#define __FLT64_IS_IEC_60559__ 2
+#define __x86_64__ 1
+#define __FLT32X_MIN_EXP__ (-1021)
+#define __DEC32_SUBNORMAL_MIN__ 0.000001E-95DF
+#define __MSVCRT__ 1
+#define __INT_FAST16_MAX__ 0x7fff
+#define __FLT64_DIG__ 15
+#define __UINT_FAST32_MAX__ 0xffffffffU
+#define __UINT_LEAST64_TYPE__ long long unsigned int
+#define __FLT_HAS_QUIET_NAN__ 1
+#define __FLT_MAX_10_EXP__ 38
+#define __LONG_MAX__ 0x7fffffffL
+#define __FLT64X_HAS_DENORM__ 1
+#define __DEC128_SUBNORMAL_MIN__ 0.000000000000000000000000000000001E-6143DL
+#define __FLT_HAS_INFINITY__ 1
+#define __GNUC_EXECUTION_CHARSET_NAME "UTF-8"
+#define __cpp_unicode_literals 200710L
+#define __UINT_FAST16_TYPE__ short unsigned int
+#define __DEC64_MAX__ 9.999999999999999E384DD
+#define __INT_FAST32_WIDTH__ 32
+#define __CHAR16_TYPE__ short unsigned int
+#define __PRAGMA_REDEFINE_EXTNAME 1
+#define __SIZE_WIDTH__ 64
+#define __SEG_FS 1
+#define __INT_LEAST16_MAX__ 0x7fff
+#define __DEC64_MANT_DIG__ 16
+#define __INT64_MAX__ 0x7fffffffffffffffLL
+#define __SEG_GS 1
+#define __FLT32_DENORM_MIN__ 1.40129846432481707092372958328991613e-45F32
+#define __SIG_ATOMIC_WIDTH__ 32
+#define __INT_LEAST64_TYPE__ long long int
+#define __INT16_TYPE__ short int
+#define __INT_LEAST8_TYPE__ signed char
+#define __nocona__ 1
+#define __cpp_structured_bindings 201606L
+#define __SIZEOF_INT__ 4
+#define __DEC32_MAX_EXP__ 97
+#define __INT_FAST8_MAX__ 0x7f
+#define __FLT128_MAX__ 1.18973149535723176508575932662800702e+4932F128
+#define __INTPTR_MAX__ 0x7fffffffffffffffLL
+#define __cpp_sized_deallocation 201309L
+#define __cpp_guaranteed_copy_elision 201606L
+#define __FLT64_HAS_QUIET_NAN__ 1
+#define __stdcall __attribute__((__stdcall__))
+#define __FLT32_MIN_10_EXP__ (-37)
+#define __EXCEPTIONS 1
+#define __GXX_MERGED_TYPEINFO_NAMES 0
+#define __PTRDIFF_WIDTH__ 64
+#define __LDBL_MANT_DIG__ 64
+#define __cpp_range_based_for 201603L
+#define __FLT64_HAS_INFINITY__ 1
+#define __FLT64X_MAX__ 1.18973149535723176502126385303097021e+4932F64x
+#define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 16
+#define __SIG_ATOMIC_MIN__ (-__SIG_ATOMIC_MAX__ - 1)
+#define __GCC_ATOMIC_LONG_LOCK_FREE 2
+#define __cpp_nontype_template_args 201411L
+#define __DEC32_MANT_DIG__ 7
+#define __cpp_return_type_deduction 201304L
+#define __INTPTR_TYPE__ long long int
+#define __UINT16_TYPE__ short unsigned int
+#define __WCHAR_TYPE__ short unsigned int
+#define __pic__ 1
+#define __UINTPTR_MAX__ 0xffffffffffffffffULL
+#define __INT_FAST64_WIDTH__ 64
+#define __cpp_decltype 200707L
+#define __INT_FAST64_MAX__ 0x7fffffffffffffffLL
+#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1
+#define __FLT_NORM_MAX__ 3.40282346638528859811704183484516925e+38F
+#define __FLT64X_MAX_EXP__ 16384
+#define __UINT_FAST64_TYPE__ long long unsigned int
+#define __cpp_inline_variables 201606L
+#define __INT_MAX__ 0x7fffffff
+#define WIN32 1
+#define __nocona 1
+#define __code_model_medium__ 1
+#define __INT64_TYPE__ long long int
+#define __FLT_MAX_EXP__ 128
+#define WIN64 1
+#define __ORDER_BIG_ENDIAN__ 4321
+#define __DBL_MANT_DIG__ 53
+#define __cpp_inheriting_constructors 201511L
+#define __SIZEOF_FLOAT128__ 16
+#define __INT_LEAST64_MAX__ 0x7fffffffffffffffLL
+#define __DEC64_MIN__ 1E-383DD
+#define __WINT_TYPE__ short unsigned int
+#define __UINT_LEAST32_TYPE__ unsigned int
+#define __SIZEOF_SHORT__ 2
+#define __FLT32_NORM_MAX__ 3.40282346638528859811704183484516925e+38F32
+#define __SSE__ 1
+#define __LDBL_MIN_EXP__ (-16381)
+#define __FLT64_MAX__ 1.79769313486231570814527423731704357e+308F64
+#define __amd64__ 1
+#define __WINT_WIDTH__ 16
+#define __INT_LEAST64_WIDTH__ 64
+#define __LDBL_MAX_EXP__ 16384
+#define __FLT32X_MAX_10_EXP__ 308
+#define __WIN32 1
+#define __SIZEOF_INT128__ 16
+#define __FLT64X_IS_IEC_60559__ 2
+#define __WCHAR_UNSIGNED__ 1
+#define __LDBL_MAX_10_EXP__ 4932
+#define __ATOMIC_RELAXED 0
+#define __DBL_EPSILON__ double(2.22044604925031308084726333618164062e-16L)
+#define __thiscall __attribute__((__thiscall__))
+#define __FLT128_MIN__ 3.36210314311209350626267781732175260e-4932F128
+#define __UINT8_C(c) c
+#define __FLT64_MAX_EXP__ 1024
+#define __INT_LEAST32_TYPE__ int
+#define __SIZEOF_WCHAR_T__ 2
+#define __GNUC_PATCHLEVEL__ 0
+#define __FLT128_NORM_MAX__ 1.18973149535723176508575932662800702e+4932F128
+#define __FLT64_NORM_MAX__ 1.79769313486231570814527423731704357e+308F64
+#define __FLT128_HAS_QUIET_NAN__ 1
+#define __INTMAX_MAX__ 0x7fffffffffffffffLL
+#define __SSE3__ 1
+#define __INT_FAST8_TYPE__ signed char
+#define __fastcall __attribute__((__fastcall__))
+#define __cpp_namespace_attributes 201411L
+#define __FLT64X_MIN__ 3.36210314311209350626267781732175260e-4932F64x
+#define __STDCPP_THREADS__ 1
+#define __GNUC_STDC_INLINE__ 1
+#define __FLT64_HAS_DENORM__ 1
+#define __FLT32_EPSILON__ 1.19209289550781250000000000000000000e-7F32
+#define __DBL_DECIMAL_DIG__ 17
+#define __STDC_UTF_32__ 1
+#define __INT_FAST8_WIDTH__ 8
+#define __FXSR__ 1
+#define __FLT32X_MAX__ 1.79769313486231570814527423731704357e+308F32x
+#define __DBL_NORM_MAX__ double(1.79769313486231570814527423731704357e+308L)
+#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
+#define __MINGW64__ 1
+#define __INTMAX_WIDTH__ 64
+#define __cpp_runtime_arrays 198712L
+#define __UINT64_TYPE__ long long unsigned int
+#define __UINT32_C(c) c ## U
+#define __cpp_alias_templates 200704L
+#define WINNT 1
+#define __FLT_DENORM_MIN__ 1.40129846432481707092372958328991613e-45F
+#define __FLT128_IS_IEC_60559__ 2
+#define __INT8_MAX__ 0x7f
+#define __LONG_WIDTH__ 32
+#define __PIC__ 1
+#define __UINT_FAST32_TYPE__ unsigned int
+#define __FLT32X_NORM_MAX__ 1.79769313486231570814527423731704357e+308F32x
+#define __CHAR32_TYPE__ unsigned int
+#define __FLT_MAX__ 3.40282346638528859811704183484516925e+38F
+#define __cpp_constexpr 201603L
+#define __SSE2__ 1
+#define __cpp_deduction_guides 201703L
+#define __INT32_TYPE__ int
+#define __SIZEOF_DOUBLE__ 8
+#define __cpp_exceptions 199711L
+#define __FLT_MIN_10_EXP__ (-37)
+#define __FLT64_MIN__ 2.22507385850720138309023271733240406e-308F64
+#define __INT_LEAST32_WIDTH__ 32
+#define __INTMAX_TYPE__ long long int
+#define _INTEGRAL_MAX_BITS 64
+#define __DEC128_MAX_EXP__ 6145
+#define __FLT32X_HAS_QUIET_NAN__ 1
+#define __ATOMIC_CONSUME 1
+#define __GNUC_MINOR__ 2
+#define __GLIBCXX_TYPE_INT_N_0 __int128
+#define __INT_FAST16_WIDTH__ 16
+#define __UINTMAX_MAX__ 0xffffffffffffffffULL
+#define __FLT32X_DENORM_MIN__ 4.94065645841246544176568792868221372e-324F32x
+#define __cpp_template_template_args 201611L
+#define __DBL_MAX_10_EXP__ 308
+#define __LDBL_DENORM_MIN__ 3.64519953188247460252840593361941982e-4951L
+#define __INT16_C(c) c
+#define __STDC__ 1
+#define __FLT32X_DIG__ 15
+#define __PTRDIFF_TYPE__ long long int
+#define __ATOMIC_SEQ_CST 5
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 1
+#define __FLT32X_MIN_10_EXP__ (-307)
+#define __UINTPTR_TYPE__ long long unsigned int
+#define __DEC64_SUBNORMAL_MIN__ 0.000000000000001E-383DD
+#define __DEC128_MANT_DIG__ 34
+#define __LDBL_MIN_10_EXP__ (-4931)
+#define __cpp_generic_lambdas 201304L
+#define __SSE_MATH__ 1
+#define __SIZEOF_LONG_LONG__ 8
+#define __cpp_user_defined_literals 200809L
+#define __FLT128_DECIMAL_DIG__ 36
+#define __GCC_ATOMIC_LLONG_LOCK_FREE 2
+#define __FLT32_HAS_QUIET_NAN__ 1
+#define __FLT_DECIMAL_DIG__ 9
+#define __UINT_FAST16_MAX__ 0xffff
+#define __LDBL_NORM_MAX__ 1.18973149535723176502126385303097021e+4932L
+#define __GCC_ATOMIC_SHORT_LOCK_FREE 2
+#define __UINT_FAST8_TYPE__ unsigned char
+#define __WIN64__ 1
+#define __cpp_init_captures 201304L
+#define __ATOMIC_ACQ_REL 4
+#define __ATOMIC_RELEASE 3
+#define __declspec(x) __attribute__((x))
--- a/frontend/release/moc_question_widget.cpp
+++ b/frontend/release/moc_question_widget.cpp
@ -0,0 +1,194 @@
+/****************************************************************************
+** Meta object code from reading C++ file 'question_widget.h'
+**
+** Created by: The Qt Meta Object Compiler version 68 (Qt 6.5.3)
+**
+** WARNING! All changes made in this file will be lost!
+*****************************************************************************/
+
+#include "../src/question_widget.h"
+#include <QtGui/qtextcursor.h>
+#include <QtCore/qmetatype.h>
+
+#if __has_include(<QtCore/qtmochelpers.h>)
+#include <QtCore/qtmochelpers.h>
+#else
+QT_BEGIN_MOC_NAMESPACE
+#endif
+
+
+#include <memory>
+
+#if !defined(Q_MOC_OUTPUT_REVISION)
+#error "The header file 'question_widget.h' doesn't include <QObject>."
+#elif Q_MOC_OUTPUT_REVISION != 68
+#error "This file was generated using the moc from 6.5.3. It"
+#error "cannot be used with the include files from this version of Qt."
+#error "(The moc has changed too much.)"
+#endif
+
+#ifndef Q_CONSTINIT
+#define Q_CONSTINIT
+#endif
+
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+QT_WARNING_DISABLE_GCC("-Wuseless-cast")
+namespace {
+
+#ifdef QT_MOC_HAS_STRINGDATA
+struct qt_meta_stringdata_CLASSQuestionWidgetENDCLASS_t {};
+static constexpr auto qt_meta_stringdata_CLASSQuestionWidgetENDCLASS = QtMocHelpers::stringData(
+    "QuestionWidget",
+    "testCompleted",
+    "",
+    "TestResult",
+    "result",
+    "onNextClicked",
+    "onSubmitClicked"
+);
+#else  // !QT_MOC_HAS_STRING_DATA
+struct qt_meta_stringdata_CLASSQuestionWidgetENDCLASS_t {
+    uint offsetsAndSizes[14];
+    char stringdata0[15];
+    char stringdata1[14];
+    char stringdata2[1];
+    char stringdata3[11];
+    char stringdata4[7];
+    char stringdata5[14];
+    char stringdata6[16];
+};
+#define QT_MOC_LITERAL(ofs, len) \
+    uint(sizeof(qt_meta_stringdata_CLASSQuestionWidgetENDCLASS_t::offsetsAndSizes) + ofs), len 
+Q_CONSTINIT static const qt_meta_stringdata_CLASSQuestionWidgetENDCLASS_t qt_meta_stringdata_CLASSQuestionWidgetENDCLASS = {
+    {
+        QT_MOC_LITERAL(0, 14),  // "QuestionWidget"
+        QT_MOC_LITERAL(15, 13),  // "testCompleted"
+        QT_MOC_LITERAL(29, 0),  // ""
+        QT_MOC_LITERAL(30, 10),  // "TestResult"
+        QT_MOC_LITERAL(41, 6),  // "result"
+        QT_MOC_LITERAL(48, 13),  // "onNextClicked"
+        QT_MOC_LITERAL(62, 15)   // "onSubmitClicked"
+    },
+    "QuestionWidget",
+    "testCompleted",
+    "",
+    "TestResult",
+    "result",
+    "onNextClicked",
+    "onSubmitClicked"
+};
+#undef QT_MOC_LITERAL
+#endif // !QT_MOC_HAS_STRING_DATA
+} // unnamed namespace
+
+Q_CONSTINIT static const uint qt_meta_data_CLASSQuestionWidgetENDCLASS[] = {
+
+ // content:
+      11,       // revision
+       0,       // classname
+       0,    0, // classinfo
+       3,   14, // methods
+       0,    0, // properties
+       0,    0, // enums/sets
+       0,    0, // constructors
+       0,       // flags
+       1,       // signalCount
+
+ // signals: name, argc, parameters, tag, flags, initial metatype offsets
+       1,    1,   32,    2, 0x06,    1 /* Public */,
+
+ // slots: name, argc, parameters, tag, flags, initial metatype offsets
+       5,    0,   35,    2, 0x08,    3 /* Private */,
+       6,    0,   36,    2, 0x08,    4 /* Private */,
+
+ // signals: parameters
+    QMetaType::Void, 0x80000000 | 3,    4,
+
+ // slots: parameters
+    QMetaType::Void,
+    QMetaType::Void,
+
+       0        // eod
+};
+
+Q_CONSTINIT const QMetaObject QuestionWidget::staticMetaObject = { {
+    QMetaObject::SuperData::link<BaseWidget::staticMetaObject>(),
+    qt_meta_stringdata_CLASSQuestionWidgetENDCLASS.offsetsAndSizes,
+    qt_meta_data_CLASSQuestionWidgetENDCLASS,
+    qt_static_metacall,
+    nullptr,
+    qt_incomplete_metaTypeArray<qt_meta_stringdata_CLASSQuestionWidgetENDCLASS_t,
+        // Q_OBJECT / Q_GADGET
+        QtPrivate::TypeAndForceComplete<QuestionWidget, std::true_type>,
+        // method 'testCompleted'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        QtPrivate::TypeAndForceComplete<const TestResult &, std::false_type>,
+        // method 'onNextClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'onSubmitClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>
+    >,
+    nullptr
+} };
+
+void QuestionWidget::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
+{
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        auto *_t = static_cast<QuestionWidget *>(_o);
+        (void)_t;
+        switch (_id) {
+        case 0: _t->testCompleted((*reinterpret_cast< std::add_pointer_t<TestResult>>(_a[1]))); break;
+        case 1: _t->onNextClicked(); break;
+        case 2: _t->onSubmitClicked(); break;
+        default: ;
+        }
+    } else if (_c == QMetaObject::IndexOfMethod) {
+        int *result = reinterpret_cast<int *>(_a[0]);
+        {
+            using _t = void (QuestionWidget::*)(const TestResult & );
+            if (_t _q_method = &QuestionWidget::testCompleted; *reinterpret_cast<_t *>(_a[1]) == _q_method) {
+                *result = 0;
+                return;
+            }
+        }
+    }
+}
+
+const QMetaObject *QuestionWidget::metaObject() const
+{
+    return QObject::d_ptr->metaObject ? QObject::d_ptr->dynamicMetaObject() : &staticMetaObject;
+}
+
+void *QuestionWidget::qt_metacast(const char *_clname)
+{
+    if (!_clname) return nullptr;
+    if (!strcmp(_clname, qt_meta_stringdata_CLASSQuestionWidgetENDCLASS.stringdata0))
+        return static_cast<void*>(this);
+    return BaseWidget::qt_metacast(_clname);
+}
+
+int QuestionWidget::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
+{
+    _id = BaseWidget::qt_metacall(_c, _id, _a);
+    if (_id < 0)
+        return _id;
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        if (_id < 3)
+            qt_static_metacall(this, _c, _id, _a);
+        _id -= 3;
+    } else if (_c == QMetaObject::RegisterMethodArgumentMetaType) {
+        if (_id < 3)
+            *reinterpret_cast<QMetaType *>(_a[0]) = QMetaType();
+        _id -= 3;
+    }
+    return _id;
+}
+
+// SIGNAL 0
+void QuestionWidget::testCompleted(const TestResult & _t1)
+{
+    void *_a[] = { nullptr, const_cast<void*>(reinterpret_cast<const void*>(std::addressof(_t1))) };
+    QMetaObject::activate(this, &staticMetaObject, 0, _a);
+}
+QT_WARNING_POP
--- a/frontend/release/moc_question_widget.o
+++ b/frontend/release/moc_question_widget.o
--- a/frontend/release/moc_result_widget.cpp
+++ b/frontend/release/moc_result_widget.cpp
@ -0,0 +1,185 @@
+/****************************************************************************
+** Meta object code from reading C++ file 'result_widget.h'
+**
+** Created by: The Qt Meta Object Compiler version 68 (Qt 6.5.3)
+**
+** WARNING! All changes made in this file will be lost!
+*****************************************************************************/
+
+#include "../src/result_widget.h"
+#include <QtGui/qtextcursor.h>
+#include <QtCore/qmetatype.h>
+
+#if __has_include(<QtCore/qtmochelpers.h>)
+#include <QtCore/qtmochelpers.h>
+#else
+QT_BEGIN_MOC_NAMESPACE
+#endif
+
+
+#include <memory>
+
+#if !defined(Q_MOC_OUTPUT_REVISION)
+#error "The header file 'result_widget.h' doesn't include <QObject>."
+#elif Q_MOC_OUTPUT_REVISION != 68
+#error "This file was generated using the moc from 6.5.3. It"
+#error "cannot be used with the include files from this version of Qt."
+#error "(The moc has changed too much.)"
+#endif
+
+#ifndef Q_CONSTINIT
+#define Q_CONSTINIT
+#endif
+
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+QT_WARNING_DISABLE_GCC("-Wuseless-cast")
+namespace {
+
+#ifdef QT_MOC_HAS_STRINGDATA
+struct qt_meta_stringdata_CLASSResultWidgetENDCLASS_t {};
+static constexpr auto qt_meta_stringdata_CLASSResultWidgetENDCLASS = QtMocHelpers::stringData(
+    "ResultWidget",
+    "restartTest",
+    "",
+    "exitTest"
+);
+#else  // !QT_MOC_HAS_STRING_DATA
+struct qt_meta_stringdata_CLASSResultWidgetENDCLASS_t {
+    uint offsetsAndSizes[8];
+    char stringdata0[13];
+    char stringdata1[12];
+    char stringdata2[1];
+    char stringdata3[9];
+};
+#define QT_MOC_LITERAL(ofs, len) \
+    uint(sizeof(qt_meta_stringdata_CLASSResultWidgetENDCLASS_t::offsetsAndSizes) + ofs), len 
+Q_CONSTINIT static const qt_meta_stringdata_CLASSResultWidgetENDCLASS_t qt_meta_stringdata_CLASSResultWidgetENDCLASS = {
+    {
+        QT_MOC_LITERAL(0, 12),  // "ResultWidget"
+        QT_MOC_LITERAL(13, 11),  // "restartTest"
+        QT_MOC_LITERAL(25, 0),  // ""
+        QT_MOC_LITERAL(26, 8)   // "exitTest"
+    },
+    "ResultWidget",
+    "restartTest",
+    "",
+    "exitTest"
+};
+#undef QT_MOC_LITERAL
+#endif // !QT_MOC_HAS_STRING_DATA
+} // unnamed namespace
+
+Q_CONSTINIT static const uint qt_meta_data_CLASSResultWidgetENDCLASS[] = {
+
+ // content:
+      11,       // revision
+       0,       // classname
+       0,    0, // classinfo
+       2,   14, // methods
+       0,    0, // properties
+       0,    0, // enums/sets
+       0,    0, // constructors
+       0,       // flags
+       2,       // signalCount
+
+ // signals: name, argc, parameters, tag, flags, initial metatype offsets
+       1,    0,   26,    2, 0x06,    1 /* Public */,
+       3,    0,   27,    2, 0x06,    2 /* Public */,
+
+ // signals: parameters
+    QMetaType::Void,
+    QMetaType::Void,
+
+       0        // eod
+};
+
+Q_CONSTINIT const QMetaObject ResultWidget::staticMetaObject = { {
+    QMetaObject::SuperData::link<BaseWidget::staticMetaObject>(),
+    qt_meta_stringdata_CLASSResultWidgetENDCLASS.offsetsAndSizes,
+    qt_meta_data_CLASSResultWidgetENDCLASS,
+    qt_static_metacall,
+    nullptr,
+    qt_incomplete_metaTypeArray<qt_meta_stringdata_CLASSResultWidgetENDCLASS_t,
+        // Q_OBJECT / Q_GADGET
+        QtPrivate::TypeAndForceComplete<ResultWidget, std::true_type>,
+        // method 'restartTest'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'exitTest'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>
+    >,
+    nullptr
+} };
+
+void ResultWidget::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
+{
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        auto *_t = static_cast<ResultWidget *>(_o);
+        (void)_t;
+        switch (_id) {
+        case 0: _t->restartTest(); break;
+        case 1: _t->exitTest(); break;
+        default: ;
+        }
+    } else if (_c == QMetaObject::IndexOfMethod) {
+        int *result = reinterpret_cast<int *>(_a[0]);
+        {
+            using _t = void (ResultWidget::*)();
+            if (_t _q_method = &ResultWidget::restartTest; *reinterpret_cast<_t *>(_a[1]) == _q_method) {
+                *result = 0;
+                return;
+            }
+        }
+        {
+            using _t = void (ResultWidget::*)();
+            if (_t _q_method = &ResultWidget::exitTest; *reinterpret_cast<_t *>(_a[1]) == _q_method) {
+                *result = 1;
+                return;
+            }
+        }
+    }
+    (void)_a;
+}
+
+const QMetaObject *ResultWidget::metaObject() const
+{
+    return QObject::d_ptr->metaObject ? QObject::d_ptr->dynamicMetaObject() : &staticMetaObject;
+}
+
+void *ResultWidget::qt_metacast(const char *_clname)
+{
+    if (!_clname) return nullptr;
+    if (!strcmp(_clname, qt_meta_stringdata_CLASSResultWidgetENDCLASS.stringdata0))
+        return static_cast<void*>(this);
+    return BaseWidget::qt_metacast(_clname);
+}
+
+int ResultWidget::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
+{
+    _id = BaseWidget::qt_metacall(_c, _id, _a);
+    if (_id < 0)
+        return _id;
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        if (_id < 2)
+            qt_static_metacall(this, _c, _id, _a);
+        _id -= 2;
+    } else if (_c == QMetaObject::RegisterMethodArgumentMetaType) {
+        if (_id < 2)
+            *reinterpret_cast<QMetaType *>(_a[0]) = QMetaType();
+        _id -= 2;
+    }
+    return _id;
+}
+
+// SIGNAL 0
+void ResultWidget::restartTest()
+{
+    QMetaObject::activate(this, &staticMetaObject, 0, nullptr);
+}
+
+// SIGNAL 1
+void ResultWidget::exitTest()
+{
+    QMetaObject::activate(this, &staticMetaObject, 1, nullptr);
+}
+QT_WARNING_POP
--- a/frontend/release/moc_result_widget.o
+++ b/frontend/release/moc_result_widget.o
--- a/frontend/release/moc_selection_widget.cpp
+++ b/frontend/release/moc_selection_widget.cpp
@ -0,0 +1,213 @@
+/****************************************************************************
+** Meta object code from reading C++ file 'selection_widget.h'
+**
+** Created by: The Qt Meta Object Compiler version 68 (Qt 6.5.3)
+**
+** WARNING! All changes made in this file will be lost!
+*****************************************************************************/
+
+#include "../src/selection_widget.h"
+#include <QtGui/qtextcursor.h>
+#include <QtCore/qmetatype.h>
+
+#if __has_include(<QtCore/qtmochelpers.h>)
+#include <QtCore/qtmochelpers.h>
+#else
+QT_BEGIN_MOC_NAMESPACE
+#endif
+
+
+#include <memory>
+
+#if !defined(Q_MOC_OUTPUT_REVISION)
+#error "The header file 'selection_widget.h' doesn't include <QObject>."
+#elif Q_MOC_OUTPUT_REVISION != 68
+#error "This file was generated using the moc from 6.5.3. It"
+#error "cannot be used with the include files from this version of Qt."
+#error "(The moc has changed too much.)"
+#endif
+
+#ifndef Q_CONSTINIT
+#define Q_CONSTINIT
+#endif
+
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+QT_WARNING_DISABLE_GCC("-Wuseless-cast")
+namespace {
+
+#ifdef QT_MOC_HAS_STRINGDATA
+struct qt_meta_stringdata_CLASSSelectionWidgetENDCLASS_t {};
+static constexpr auto qt_meta_stringdata_CLASSSelectionWidgetENDCLASS = QtMocHelpers::stringData(
+    "SelectionWidget",
+    "startRequest",
+    "",
+    "difficulty",
+    "questionCount",
+    "onPrimaryClicked",
+    "onJuniorClicked",
+    "onSeniorClicked",
+    "onStartClicked"
+);
+#else  // !QT_MOC_HAS_STRING_DATA
+struct qt_meta_stringdata_CLASSSelectionWidgetENDCLASS_t {
+    uint offsetsAndSizes[18];
+    char stringdata0[16];
+    char stringdata1[13];
+    char stringdata2[1];
+    char stringdata3[11];
+    char stringdata4[14];
+    char stringdata5[17];
+    char stringdata6[16];
+    char stringdata7[16];
+    char stringdata8[15];
+};
+#define QT_MOC_LITERAL(ofs, len) \
+    uint(sizeof(qt_meta_stringdata_CLASSSelectionWidgetENDCLASS_t::offsetsAndSizes) + ofs), len 
+Q_CONSTINIT static const qt_meta_stringdata_CLASSSelectionWidgetENDCLASS_t qt_meta_stringdata_CLASSSelectionWidgetENDCLASS = {
+    {
+        QT_MOC_LITERAL(0, 15),  // "SelectionWidget"
+        QT_MOC_LITERAL(16, 12),  // "startRequest"
+        QT_MOC_LITERAL(29, 0),  // ""
+        QT_MOC_LITERAL(30, 10),  // "difficulty"
+        QT_MOC_LITERAL(41, 13),  // "questionCount"
+        QT_MOC_LITERAL(55, 16),  // "onPrimaryClicked"
+        QT_MOC_LITERAL(72, 15),  // "onJuniorClicked"
+        QT_MOC_LITERAL(88, 15),  // "onSeniorClicked"
+        QT_MOC_LITERAL(104, 14)   // "onStartClicked"
+    },
+    "SelectionWidget",
+    "startRequest",
+    "",
+    "difficulty",
+    "questionCount",
+    "onPrimaryClicked",
+    "onJuniorClicked",
+    "onSeniorClicked",
+    "onStartClicked"
+};
+#undef QT_MOC_LITERAL
+#endif // !QT_MOC_HAS_STRING_DATA
+} // unnamed namespace
+
+Q_CONSTINIT static const uint qt_meta_data_CLASSSelectionWidgetENDCLASS[] = {
+
+ // content:
+      11,       // revision
+       0,       // classname
+       0,    0, // classinfo
+       5,   14, // methods
+       0,    0, // properties
+       0,    0, // enums/sets
+       0,    0, // constructors
+       0,       // flags
+       1,       // signalCount
+
+ // signals: name, argc, parameters, tag, flags, initial metatype offsets
+       1,    2,   44,    2, 0x06,    1 /* Public */,
+
+ // slots: name, argc, parameters, tag, flags, initial metatype offsets
+       5,    0,   49,    2, 0x08,    4 /* Private */,
+       6,    0,   50,    2, 0x08,    5 /* Private */,
+       7,    0,   51,    2, 0x08,    6 /* Private */,
+       8,    0,   52,    2, 0x08,    7 /* Private */,
+
+ // signals: parameters
+    QMetaType::Void, QMetaType::QString, QMetaType::Int,    3,    4,
+
+ // slots: parameters
+    QMetaType::Void,
+    QMetaType::Void,
+    QMetaType::Void,
+    QMetaType::Void,
+
+       0        // eod
+};
+
+Q_CONSTINIT const QMetaObject SelectionWidget::staticMetaObject = { {
+    QMetaObject::SuperData::link<BaseWidget::staticMetaObject>(),
+    qt_meta_stringdata_CLASSSelectionWidgetENDCLASS.offsetsAndSizes,
+    qt_meta_data_CLASSSelectionWidgetENDCLASS,
+    qt_static_metacall,
+    nullptr,
+    qt_incomplete_metaTypeArray<qt_meta_stringdata_CLASSSelectionWidgetENDCLASS_t,
+        // Q_OBJECT / Q_GADGET
+        QtPrivate::TypeAndForceComplete<SelectionWidget, std::true_type>,
+        // method 'startRequest'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        QtPrivate::TypeAndForceComplete<const QString &, std::false_type>,
+        QtPrivate::TypeAndForceComplete<int, std::false_type>,
+        // method 'onPrimaryClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'onJuniorClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'onSeniorClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>,
+        // method 'onStartClicked'
+        QtPrivate::TypeAndForceComplete<void, std::false_type>
+    >,
+    nullptr
+} };
+
+void SelectionWidget::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
+{
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        auto *_t = static_cast<SelectionWidget *>(_o);
+        (void)_t;
+        switch (_id) {
+        case 0: _t->startRequest((*reinterpret_cast< std::add_pointer_t<QString>>(_a[1])),(*reinterpret_cast< std::add_pointer_t<int>>(_a[2]))); break;
+        case 1: _t->onPrimaryClicked(); break;
+        case 2: _t->onJuniorClicked(); break;
+        case 3: _t->onSeniorClicked(); break;
+        case 4: _t->onStartClicked(); break;
+        default: ;
+        }
+    } else if (_c == QMetaObject::IndexOfMethod) {
+        int *result = reinterpret_cast<int *>(_a[0]);
+        {
+            using _t = void (SelectionWidget::*)(const QString & , int );
+            if (_t _q_method = &SelectionWidget::startRequest; *reinterpret_cast<_t *>(_a[1]) == _q_method) {
+                *result = 0;
+                return;
+            }
+        }
+    }
+}
+
+const QMetaObject *SelectionWidget::metaObject() const
+{
+    return QObject::d_ptr->metaObject ? QObject::d_ptr->dynamicMetaObject() : &staticMetaObject;
+}
+
+void *SelectionWidget::qt_metacast(const char *_clname)
+{
+    if (!_clname) return nullptr;
+    if (!strcmp(_clname, qt_meta_stringdata_CLASSSelectionWidgetENDCLASS.stringdata0))
+        return static_cast<void*>(this);
+    return BaseWidget::qt_metacast(_clname);
+}
+
+int SelectionWidget::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
+{
+    _id = BaseWidget::qt_metacall(_c, _id, _a);
+    if (_id < 0)
+        return _id;
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        if (_id < 5)
+            qt_static_metacall(this, _c, _id, _a);
+        _id -= 5;
+    } else if (_c == QMetaObject::RegisterMethodArgumentMetaType) {
+        if (_id < 5)
+            *reinterpret_cast<QMetaType *>(_a[0]) = QMetaType();
+        _id -= 5;
+    }
+    return _id;
+}
+
+// SIGNAL 0
+void SelectionWidget::startRequest(const QString & _t1, int _t2)
+{
+    void *_a[] = { nullptr, const_cast<void*>(reinterpret_cast<const void*>(std::addressof(_t1))), const_cast<void*>(reinterpret_cast<const void*>(std::addressof(_t2))) };
+    QMetaObject::activate(this, &staticMetaObject, 0, _a);
+}
+QT_WARNING_POP
--- a/frontend/release/moc_selection_widget.o
+++ b/frontend/release/moc_selection_widget.o
--- a/frontend/release/object_script.examSystem.Release
+++ b/frontend/release/object_script.examSystem.Release
@ -0,0 +1,14 @@
+release/main.o
+release/main_window.o
+release/login_widget.o
+release/selection_widget.o
+release/question_widget.o
+release/result_widget.o
+release/base_widget.o
+release/qrc_qmake_qmake_qm_files.o
+release/moc_main_window.o
+release/moc_login_widget.o
+release/moc_selection_widget.o
+release/moc_question_widget.o
+release/moc_result_widget.o
+release/moc_base_widget.o
--- a/frontend/release/qmake_qmake_qm_files.qrc
+++ b/frontend/release/qmake_qmake_qm_files.qrc
@ -0,0 +1,5 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource prefix="i18n">
+<file alias="examSystem_zh_CN.qm">E:/qt_project/examSystem/frontend/release/examSystem_zh_CN.qm</file>
+</qresource>
+</RCC>
--- a/frontend/release/qrc_qmake_qmake_qm_files.cpp
+++ b/frontend/release/qrc_qmake_qmake_qm_files.cpp
@ -0,0 +1,101 @@
+/****************************************************************************
+** Resource object code
+**
+** Created by: The Resource Compiler for Qt version 6.5.3
+**
+** WARNING! All changes made in this file will be lost!
+*****************************************************************************/
+
+static const unsigned char qt_resource_data[] = {
+  // E:/qt_project/examSystem/frontend/release/examSystem_zh_CN.qm
+  0x0,0x0,0x0,0x1a,
+  0x3c,
+  0xb8,0x64,0x18,0xca,0xef,0x9c,0x95,0xcd,0x21,0x1c,0xbf,0x60,0xa1,0xbd,0xdd,0xa7,
+  0x0,0x0,0x0,0x5,0x7a,0x68,0x5f,0x43,0x4e,
+  
+};
+
+static const unsigned char qt_resource_name[] = {
+  // i18n
+  0x0,0x4,
+  0x0,0x6,0xc4,0xee,
+  0x0,0x69,
+  0x0,0x31,0x0,0x38,0x0,0x6e,
+    // examSystem_zh_CN.qm
+  0x0,0x13,
+  0xc,0xd0,0xd4,0x3d,
+  0x0,0x65,
+  0x0,0x78,0x0,0x61,0x0,0x6d,0x0,0x53,0x0,0x79,0x0,0x73,0x0,0x74,0x0,0x65,0x0,0x6d,0x0,0x5f,0x0,0x7a,0x0,0x68,0x0,0x5f,0x0,0x43,0x0,0x4e,0x0,0x2e,
+  0x0,0x71,0x0,0x6d,
+  
+};
+
+static const unsigned char qt_resource_struct[] = {
+  // :
+  0x0,0x0,0x0,0x0,0x0,0x2,0x0,0x0,0x0,0x1,0x0,0x0,0x0,0x1,
+0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
+  // :/i18n
+  0x0,0x0,0x0,0x0,0x0,0x2,0x0,0x0,0x0,0x1,0x0,0x0,0x0,0x2,
+0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
+  // :/i18n/examSystem_zh_CN.qm
+  0x0,0x0,0x0,0xe,0x0,0x0,0x0,0x0,0x0,0x1,0x0,0x0,0x0,0x0,
+0x0,0x0,0x1,0x99,0xc9,0xb7,0x79,0xfa,
+
+};
+
+#ifdef QT_NAMESPACE
+#  define QT_RCC_PREPEND_NAMESPACE(name) ::QT_NAMESPACE::name
+#  define QT_RCC_MANGLE_NAMESPACE0(x) x
+#  define QT_RCC_MANGLE_NAMESPACE1(a, b) a##_##b
+#  define QT_RCC_MANGLE_NAMESPACE2(a, b) QT_RCC_MANGLE_NAMESPACE1(a,b)
+#  define QT_RCC_MANGLE_NAMESPACE(name) QT_RCC_MANGLE_NAMESPACE2( \
+        QT_RCC_MANGLE_NAMESPACE0(name), QT_RCC_MANGLE_NAMESPACE0(QT_NAMESPACE))
+#else
+#   define QT_RCC_PREPEND_NAMESPACE(name) name
+#   define QT_RCC_MANGLE_NAMESPACE(name) name
+#endif
+
+#ifdef QT_NAMESPACE
+namespace QT_NAMESPACE {
+#endif
+
+bool qRegisterResourceData(int, const unsigned char *, const unsigned char *, const unsigned char *);
+bool qUnregisterResourceData(int, const unsigned char *, const unsigned char *, const unsigned char *);
+
+#ifdef QT_NAMESPACE
+}
+#endif
+
+int QT_RCC_MANGLE_NAMESPACE(qInitResources_qmake_qmake_qm_files)();
+int QT_RCC_MANGLE_NAMESPACE(qInitResources_qmake_qmake_qm_files)()
+{
+    int version = 3;
+    QT_RCC_PREPEND_NAMESPACE(qRegisterResourceData)
+        (version, qt_resource_struct, qt_resource_name, qt_resource_data);
+    return 1;
+}
+
+int QT_RCC_MANGLE_NAMESPACE(qCleanupResources_qmake_qmake_qm_files)();
+int QT_RCC_MANGLE_NAMESPACE(qCleanupResources_qmake_qmake_qm_files)()
+{
+    int version = 3;
+    QT_RCC_PREPEND_NAMESPACE(qUnregisterResourceData)
+       (version, qt_resource_struct, qt_resource_name, qt_resource_data);
+    return 1;
+}
+
+#ifdef __clang__
+#   pragma clang diagnostic push
+#   pragma clang diagnostic ignored "-Wexit-time-destructors"
+#endif
+
+namespace {
+   struct initializer {
+       initializer() { QT_RCC_MANGLE_NAMESPACE(qInitResources_qmake_qmake_qm_files)(); }
+       ~initializer() { QT_RCC_MANGLE_NAMESPACE(qCleanupResources_qmake_qmake_qm_files)(); }
+   } dummy;
+}
+
+#ifdef __clang__
+#   pragma clang diagnostic pop
+#endif
--- a/frontend/release/qrc_qmake_qmake_qm_files.o
+++ b/frontend/release/qrc_qmake_qmake_qm_files.o
--- a/frontend/release/question_widget.o
+++ b/frontend/release/question_widget.o
--- a/frontend/release/result_widget.o
+++ b/frontend/release/result_widget.o
--- a/frontend/release/selection_widget.o
+++ b/frontend/release/selection_widget.o
--- a/frontend/ui_mainwindow.h
+++ b/frontend/ui_mainwindow.h
@ -0,0 +1,62 @@
+/********************************************************************************
+** Form generated from reading UI file 'mainwindow.ui'
+**
+** Created by: Qt User Interface Compiler version 6.5.3
+**
+** WARNING! All changes made in this file will be lost when recompiling UI file!
+********************************************************************************/
+
+#ifndef UI_MAINWINDOW_H
+#define UI_MAINWINDOW_H
+
+#include <QtCore/QVariant>
+#include <QtWidgets/QApplication>
+#include <QtWidgets/QMainWindow>
+#include <QtWidgets/QMenuBar>
+#include <QtWidgets/QStatusBar>
+#include <QtWidgets/QWidget>
+
+QT_BEGIN_NAMESPACE
+
+class Ui_MainWindow
+{
+public:
+    QWidget *centralwidget;
+    QMenuBar *menubar;
+    QStatusBar *statusbar;
+
+    void setupUi(QMainWindow *MainWindow)
+    {
+        if (MainWindow->objectName().isEmpty())
+            MainWindow->setObjectName("MainWindow");
+        MainWindow->resize(800, 600);
+        centralwidget = new QWidget(MainWindow);
+        centralwidget->setObjectName("centralwidget");
+        MainWindow->setCentralWidget(centralwidget);
+        menubar = new QMenuBar(MainWindow);
+        menubar->setObjectName("menubar");
+        menubar->setGeometry(QRect(0, 0, 800, 25));
+        MainWindow->setMenuBar(menubar);
+        statusbar = new QStatusBar(MainWindow);
+        statusbar->setObjectName("statusbar");
+        MainWindow->setStatusBar(statusbar);
+
+        retranslateUi(MainWindow);
+
+        QMetaObject::connectSlotsByName(MainWindow);
+    } // setupUi
+
+    void retranslateUi(QMainWindow *MainWindow)
+    {
+        MainWindow->setWindowTitle(QCoreApplication::translate("MainWindow", "MainWindow", nullptr));
+    } // retranslateUi
+
+};
+
+namespace Ui {
+    class MainWindow: public Ui_MainWindow {};
+} // namespace Ui
+
+QT_END_NAMESPACE
+
+#endif // UI_MAINWINDOW_H
--- a/src/backend/exam_system/exam_system.cc
+++ b/src/backend/exam_system/exam_system.cc
@ -414,7 +414,7 @@ GenerateResponse ExamSystem::GenerateProblems(const GenerateRequest& request) {
                ", 数量: " + std::to_string(request.count));
    return response;
  }
-  SwitchProblemType(request.username, request.difficulty);
+  
  // 获取用户生成器
  ProblemGenerator* generator = GetUserGenerator(request.username);
  if (!generator) {
@ -864,7 +864,7 @@ std::string ExamSystem::CalculateAnswer(const std::string& expression) {
  // 替换√为sqrt
  pos = 0;
  while ((pos = expr.find("√", pos)) != std::string::npos) {
-      expr.replace(pos, 3, "sqrt");
+      expr.replace(pos, 1, "sqrt");
  }

  try {
--- a/src/backend/problem_generator/problem_generator.cc
+++ b/src/backend/problem_generator/problem_generator.cc
@ -343,7 +343,7 @@ class BaseProblemGenerator : public ProblemGenerator {
           1, 
           static_cast<int>(std::sqrt(constants::kMaxOperandValue)))(generator);
       int squared_value = base * base;
-       return "√(" + std::to_string(squared_value)+ ")";
+       return "√" + std::to_string(squared_value);
     }
   }
   
--- a/src/frontend/login_widget.cc
+++ b/src/frontend/login_widget.cc
@ -197,31 +197,30 @@ void LoginWidget::onSendCodeClicked()
        return;
    }
    
-    // // 如果已经在倒计时，直接返回
-    // if (countdownTimer && countdownTimer->isActive()) {
-    //     showMessage("请等待倒计时结束");
-    //     return;
-    // }
+    // 如果已经在倒计时，直接返回
+    if (countdownTimer && countdownTimer->isActive()) {
+        showMessage("请等待倒计时结束");
+        return;
+    }

-    
    bool result = backend->SendVerificationCode(email.toStdString());
    if(result){
        showMessage("验证码已发送到您的邮箱，请查收");
    } else{
-        showMessage("邮箱已被注册或者输入邮箱有误");
+        showMessage("邮箱已被注册");
+    }
+    
+    // 初始化或重置计时器
+    if (!countdownTimer) {
+        countdownTimer = new QTimer(this);
+        connect(countdownTimer, &QTimer::timeout, this, &LoginWidget::onCountdownTimeout);
    }
    
-    // // 初始化或重置计时器
-    // if (!countdownTimer) {
-    //     countdownTimer = new QTimer(this);
-    //     connect(countdownTimer, &QTimer::timeout, this, &LoginWidget::onCountdownTimeout);
-    // }
-    
-    // // 开始倒计时
-    // sendCodeBtn->setEnabled(false);
-    // countdown_seconds_ = 60;
-    // sendCodeBtn->setText(QString("%1秒后重发").arg(countdown_seconds_));
-    // countdownTimer->start(1000);
+    // 开始倒计时
+    sendCodeBtn->setEnabled(false);
+    countdown_seconds_ = 60;
+    sendCodeBtn->setText(QString("%1秒后重发").arg(countdown_seconds_));
+    countdownTimer->start(1000);
    
 }

--- a/src/frontend/main_window.cc
+++ b/src/frontend/main_window.cc
@ -43,7 +43,6 @@ void MainWindow::showSelection(const QString& userName) {
 }

 void MainWindow::showQuestions(const QString& difficulty, int count) {
-    questionWidget->clearAnswers();
    questionWidget->startTest(difficulty, count);
    stackedWidget->setCurrentWidget(questionWidget);
 }
--- a/src/frontend/question_widget.h
+++ b/src/frontend/question_widget.h
@ -17,7 +17,6 @@ class QuestionWidget : public BaseWidget {
 public:
    explicit QuestionWidget(exam_system::BackendInterface* backend, QWidget* parent = nullptr);
    void startTest(const QString& difficulty, int questionCount);
-    void clearAnswers(){ user_answers_.clear(); }

 signals:
    void testCompleted(const exam_system::TestResult& result);
--- a/src/frontend/result_widget.cc
+++ b/src/frontend/result_widget.cc
@ -40,13 +40,9 @@ void ResultWidget::setupUI() {
 void ResultWidget::showResult(const exam_system::TestResult& result) {
    scoreLabel->setText(QString::number(result.score, 'f', 1) + "分");
    
-    double correct_rate = (result.total_questions > 0) 
-        ? (static_cast<double>(result.correct_answers) / result.total_questions) * 100.0 
-        : 0.0;
-    
-    QString detail = QString("正确题目: %1/%2\n正确率: %3%")
+    QString detail = QString("难度: %1\n正确题目: %2/%3")
+                    .arg(QString::fromStdString(result.difficulty))
                    .arg(result.correct_answers)
-                    .arg(result.total_questions)
-                    .arg(correct_rate, 0, 'f', 1);  // 保留1位小数
+                    .arg(result.total_questions);
    detailLabel->setText(detail);
 }
--- a/src/main/main.cc
+++ b/src/main/main.cc
@ -1,11 +1,8 @@
 #include <QApplication>
-// #include <windows.h>
 #include "../frontend/main_window.h"
 #include "../shared/backend_interface.h"

 int main(int argc, char *argv[]) {
-    // SetConsoleOutputCP(CP_UTF8);  // 输出编码设定
-    // SetConsoleCP(CP_UTF8);        // 输入编码设定
    QApplication app(argc, argv);
    
    std::unique_ptr<exam_system::BackendInterface> backend = std::make_unique<exam_system::BackendImpl>();
--- a/src/shared/backend_interface.cc
+++ b/src/shared/backend_interface.cc
@ -1,12 +1,21 @@
 #include "backend_interface.h"
+#include <iostream>
 #include <random>
 #include <algorithm>
 #include <sstream>
 #include <iomanip>
 #include <stack>
-#include <iostream>
 #include <chrono>

+#include<QByteArray>
+#include<QString>
+#include<QTcpSocket>
+#include <QSslSocket>
+#include <QDebug>
+#include <QDateTime>
+#include <QSslConfiguration>
+#include <QSslCertificate>
+#include <QSslKey>
 // #include <uuid/uuid.h>  // 如果需要生成UUID

 namespace exam_system {
@ -29,24 +38,60 @@ BackendImpl::BackendImpl() {
    // 初始化 ExamSystem
    exam_system_ = std::make_unique<ExamSystem>();
    
+    // 配置邮箱设置 - 使用qq邮箱
    email_config_.smtp_server = "smtp.qq.com";
    email_config_.smtp_port = 465;  // 使用SSL端口
-    email_config_.username = "3315384591@qq.com";  
-    email_config_.password = "jobgsqxruxtgdaig";  
-    email_config_.use_curl = true;
-    email_config_.skip_peer_verification = true;  
-    email_config_.skip_hostname_verification = true;
+    email_config_.username = "3315384591@qq.com";  // 替换为真实邮箱
+    email_config_.password = "jobgsqxruxtgdaig";  // 替换为真实授权码
    
-    // // 初始化libcurl
+    // 初始化libcurl
    // curl_global_init(CURL_GLOBAL_DEFAULT);
    
    Logger::Log(Logger::Level::INFO, "BackendImpl初始化完成");
 }

-// BackendImpl::~BackendImpl() {
-//     curl_global_cleanup();
-// }
+BackendImpl::~BackendImpl() {
+    // curl_global_cleanup();
+}

+bool BackendImpl::SendVerificationCode(const std::string& email) {
+    if (email.empty() || email.find('@') == std::string::npos) {
+        Logger::Log(Logger::Level::WARNING, "邮箱地址格式无效: " + email);
+        return false;
+    }
+    
+    // 清理过期的验证码
+    CleanExpiredVerificationCodes();
+    
+    // 生成验证码
+    std::string code = GenerateVerificationCode();
+    
+    // 保存验证码
+    VerificationCode vc;
+    vc.code = code;
+    vc.generate_time = std::time(nullptr);
+    vc.email = email;
+    verification_codes_[email] = vc;
+    
+    // 发送邮件
+    std::string subject = "数学考试系统 - 验证码";
+    std::string body = "您的验证码是: " + code + "\r\n\r\n";
+    body += "该验证码有效期为5分钟，请尽快使用。\r\n";
+    body += "如果不是您本人操作，请忽略此邮件。\r\n\r\n";
+    body += "数学考试系统团队";
+    
+    bool send_success = SendEmail(email, subject, body);
+    
+    if (send_success) {
+        Logger::Log(Logger::Level::INFO, 
+                   "验证码发送成功至: " + email + ", 验证码: " + code);
+        return true;
+    } else {
+        Logger::Log(Logger::Level::ERROR, "验证码发送失败: " + email);
+        verification_codes_.erase(email);
+        return false;
+    }
+}

 bool waitForResponse(QSslSocket* socket) {
    if (!socket->waitForReadyRead(15000)) { // 增加超时时间到15秒
@ -271,59 +316,44 @@ QString BackendImpl::BuildEmailPayload(const std::string& recipient,
    return payload;
 }

-
-
-bool BackendImpl::SendVerificationCode(const std::string& email) {
-    if (email.empty() || email.find('@') == std::string::npos) {
-        // Logger::Log(Logger::Level::ERROR, "邮箱地址格式无效: " + email);
-        return false;
-    }
-    // 清理过期的验证码
-    CleanExpiredVerificationCodes();
+// 生成消息ID
+std::string BackendImpl::GenerateMessageId() {
+    auto now = std::chrono::system_clock::now();
+    auto timestamp = std::chrono::duration_cast<std::chrono::milliseconds>(
+        now.time_since_epoch()).count();
    
-    // 生成验证码
-    std::string code = GenerateVerificationCode();
-    
-    // 保存验证码
-    VerificationCode vc;
-    vc.code = code;
-    vc.generate_time = std::time(nullptr);
-    vc.email = email;
-    verification_codes_[email] = vc;
+    std::random_device rd;
+    std::mt19937 gen(rd());
+    std::uniform_int_distribution<int> dis(1000, 9999);
    
-    // 发送邮件
-    std::string subject = "数学考试系统 - 验证码";
-    std::string body = "您的验证码是: " + code + "\r\n\r\n";
-    body += "该验证码有效期为5分钟，请尽快使用。\r\n";
-    body += "如果不是您本人操作，请忽略此邮件。\r\n\r\n";
-    body += "数学考试系统团队";
+    return "math_exam_" + std::to_string(timestamp) + "_" + std::to_string(dis(gen));
+}
+
+// 获取当前日期时间字符串
+std::string BackendImpl::GetCurrentDateTime() {
+    std::time_t now = std::time(nullptr);
+    std::tm* tm_info = std::localtime(&now);
    
-    bool send_success = SendEmail(email, subject, body);
+    char buffer[80];
+    std::strftime(buffer, sizeof(buffer), "%a, %d %b %Y %H:%M:%S %z", tm_info);
    
-    if (send_success) {
-        Logger::Log(Logger::Level::INFO, 
-                   "验证码发送成功至: " + email + ", 验证码: " + code);
-        return true;
-    } else {
-        // Logger::Log(Logger::Level::ERROR, "验证码发送失败: " + email);
-        verification_codes_.erase(email);
-        return false;
-    }
+    return std::string(buffer);
 }

+
 bool BackendImpl::UserRegister(const std::string& username,
                              const std::string& password,
                              const std::string& email,
                              const std::string& code) {
    // 输入验证
    if (username.empty() || password.empty() || email.empty() || code.empty()) {
-        // Logger::Log(Logger::Level::ERROR, "注册信息不完整");
+        Logger::Log(Logger::Level::ERROR, "注册信息不完整");
        return false;
    }
    
    // 验证邮箱验证码
    if (!ValidateVerificationCode(email, code)) {
-        // Logger::Log(Logger::Level::ERROR, "验证码错误或已过期");
+        Logger::Log(Logger::Level::ERROR, "验证码错误或已过期");
        return false;
    }
    
@ -342,7 +372,7 @@ bool BackendImpl::UserRegister(const std::string& username,
        Logger::Log(Logger::Level::INFO, 
                   "用户注册成功: " + username + ", 邮箱: " + email);
    } else {
-        // Logger::Log(Logger::Level::ERROR, "用户注册失败: " + username);
+        Logger::Log(Logger::Level::ERROR, "用户注册失败: " + username);
    }
    
    return success;
@ -351,7 +381,7 @@ bool BackendImpl::UserRegister(const std::string& username,
 bool BackendImpl::UserLogin(const std::string& username,
                           const std::string& password) {
    if (username.empty() || password.empty()) {
-        // Logger::Log(Logger::Level::ERROR, "用户名或密码为空");
+        Logger::Log(Logger::Level::ERROR, "用户名或密码为空");
        return false;
    }
    
@ -367,8 +397,8 @@ bool BackendImpl::UserLogin(const std::string& username,
        Logger::Log(Logger::Level::INFO, "用户登录成功: " + username);
        return true;
    } else {
-        // Logger::Log(Logger::Level::ERROR, 
-        //            "用户登录失败: " + username + ", 错误: " + response.error_message);
+        Logger::Log(Logger::Level::ERROR,
+                   "用户登录失败: " + username + ", 错误: " + response.error_message);
        return false;
    }
 }
@ -386,12 +416,12 @@ void BackendImpl::UserLogout() {
 bool BackendImpl::ChangePassword(const std::string& old_password,
                                const std::string& new_password) {
    if (current_user_.empty()) {
-        // Logger::Log(Logger::Level::ERROR, "用户未登录，无法修改密码");
+        Logger::Log(Logger::Level::ERROR, "用户未登录，无法修改密码");
        return false;
    }
    
    if (new_password.empty()) {
-        // Logger::Log(Logger::Level::ERROR, "新密码不能为空");
+        Logger::Log(Logger::Level::ERROR, "新密码不能为空");
        return false;
    }
    
@ -407,8 +437,8 @@ bool BackendImpl::ChangePassword(const std::string& old_password,
        Logger::Log(Logger::Level::INFO, "密码修改成功: " + current_user_);
        return true;
    } else {
-        // Logger::Log(Logger::Level::ERROR, 
-        //            "密码修改失败: " + current_user_ + ", 错误: " + response.error_message);
+        Logger::Log(Logger::Level::ERROR,
+                   "密码修改失败: " + current_user_ + ", 错误: " + response.error_message);
        return false;
    }
 }
@ -427,7 +457,7 @@ std::vector<QuestionInfo> BackendImpl::GenerateQuestions(
        {"senior", "高中"}
    };
    if (current_user_.empty()) {
-        // Logger::Log(Logger::Level::ERROR, "用户未登录，无法生成题目");
+        Logger::Log(Logger::Level::ERROR, "用户未登录，无法生成题目");
        return questions;
    }
    
@ -440,8 +470,8 @@ std::vector<QuestionInfo> BackendImpl::GenerateQuestions(
    GenerateResponse response = exam_system_->GenerateProblems(request);
    
    if (!response.success) {
-        // Logger::Log(Logger::Level::ERROR, 
-        //            "生成题目失败: " + response.error_message);
+        Logger::Log(Logger::Level::ERROR,
+                   "生成题目失败: " + response.error_message);
        return questions;
    }
    
@ -500,14 +530,14 @@ exam_system::TestResult BackendImpl::SubmitAnswers(const std::vector<int>& user_
    result.difficulty = "unknown";
    
    if (current_user_.empty()) {
-        // Logger::Log(Logger::Level::ERROR, "用户未登录，无法提交答案");
+        Logger::Log(Logger::Level::ERROR, "用户未登录，无法提交答案");
        return result;
    }
    
    // 获取用户当前题目
    auto it = user_questions_.find(current_user_);
    if (it == user_questions_.end()) {
-        // Logger::Log(Logger::Level::ERROR, "用户没有生成的题目");
+        Logger::Log(Logger::Level::ERROR, "用户没有生成的题目");
        return result;
    }
    
@ -515,10 +545,10 @@ exam_system::TestResult BackendImpl::SubmitAnswers(const std::vector<int>& user_
    result.total_questions = questions.size();
    
    if (user_answers.size() != questions.size()) {
-        // Logger::Log(Logger::Level::ERROR, 
-        //            "答案数量与题目数量不匹配: " + 
-        //            std::to_string(user_answers.size()) + " vs " + 
-        //            std::to_string(questions.size()));
+        Logger::Log(Logger::Level::ERROR,
+                   "答案数量与题目数量不匹配: " +
+                   std::to_string(user_answers.size()) + " vs " +
+                   std::to_string(questions.size()));
        return result;
    }
    
@ -602,7 +632,7 @@ void BackendImpl::CleanExpiredVerificationCodes() {
    
    for (const auto& email : expired_emails) {
        verification_codes_.erase(email);
-        Logger::Log(Logger::Level::INFO, "清理过期验证码: " + email);
+        Logger::Log(Logger::Level::WARNING, "清理过期验证码: " + email);
    }
 }

@ -661,4 +691,4 @@ double BackendImpl::CalculateScore(int correct_count, int total_count) {
    return (static_cast<double>(correct_count) / total_count) * 100.0;
 }

-}  // namespace exam_system
+}  // namespace exam_system
--- a/src/shared/backend_interface.h
+++ b/src/shared/backend_interface.h
@ -6,16 +6,8 @@
 #include <memory>
 #include <map>
 #include <ctime>
-#include<QByteArray>
-#include<QString>
-#include<QTcpSocket>
-#include <QSslSocket>
-#include <QDebug>
-#include <QDateTime>
-#include <QSslConfiguration>
-#include <QSslCertificate>
-#include <QSslKey>
 #include "../backend/exam_system/exam_system.h"
+#include <QString>

 namespace exam_system {

@ -48,18 +40,6 @@ struct EmailConfig {
    int smtp_port = 465;  // 默认使用465端口
    std::string username = "3315384591@qq.com";
    std::string password = "jobgsqxruxtgdaig";
-    bool use_curl = true;
-    bool skip_peer_verification = false;  // 新增：跳过证书验证
-    bool skip_hostname_verification = false;  // 新增：跳过主机名验证
-};
-
-// 邮件上传状态结构体
-struct EmailUploadStatus {
-    const std::vector<std::string>* payload_text;
-    size_t lines_read;
-    
-    EmailUploadStatus(const std::vector<std::string>* text) 
-        : payload_text(text), lines_read(0) {}
 };

 // 前后端通信接口
@ -87,7 +67,7 @@ class BackendInterface {
 class BackendImpl : public BackendInterface {
 public:
  BackendImpl();
-  ~BackendImpl() override = default;
+  ~BackendImpl() override;

  BackendImpl(const BackendImpl&) = delete;
  BackendImpl& operator=(const BackendImpl&) = delete;
@ -117,8 +97,8 @@ class BackendImpl : public BackendInterface {
                       const std::string& subject,
                       const std::string& body);
  
-  // 邮件内容生成
-  QString BuildEmailPayload(const std::string& recipient,const std::string& subject,const std::string& body);
+      // 邮件内容生成
+      QString BuildEmailPayload(const std::string& recipient,const std::string& subject,const std::string& body);

  std::string GenerateMessageId();
  std::string GetCurrentDateTime();
@ -148,4 +128,4 @@ class BackendImpl : public BackendInterface {

 }  // namespace exam_system

-#endif  // BACKEND_INTERFACE_H
+#endif  // BACKEND_INTERFACE_H
--- a/users.csv
+++ b/users.csv
@ -2,4 +2,12 @@
 # 用户类型: 小学, 初中, 高中
 # 自动生成 - 请勿手动编辑

-zhangsan1,abc123,小学,zhangsan1@example.com
+zhangsan1,Erp91637,小学,zhangsan1@example.com
+zhangsan2,123,小学,zhangsan2@example.com
+zhangsan3,123,小学,zhangsan3@example.com
+lisi1,123,初中,lisi1@example.com
+lisi2,123,初中,lisi2@example.com
+lisi3,123,初中,lisi3@example.com
+wangwu1,123,高中,wangwu1@example.com
+wangwu2,123,高中,wangwu2@example.com
+wangwu3,123,高中,wangwu3@example.com
--- a/zhangsan1/2025-10-12-16-36-11.txt
+++ b/zhangsan1/2025-10-12-16-36-11.txt
@ -0,0 +1,19 @@
+1. 21 * 13 + 54 / 98
+
+2. 44 - 6
+
+3. 73 + 90 * 73 / 36 - 23
+
+4. 28 / 39 * 46
+
+5. 92 * 55
+
+6. 32 / 50
+
+7. 73 * 74 + 71 / 73
+
+8. 90 * 28 + 14 - 78 - 5
+
+9. 2 / 57
+
+10. 95 + 99 * 85 / 92 - 33
--- a/zhangsan1/2025-10-12-16-39-45.txt
+++ b/zhangsan1/2025-10-12-16-39-45.txt
@ -0,0 +1,19 @@
+1. 68 - 43 / 84 / 9 + 9
+
+2. 15 / 92 / 46 * 60 * 88
+
+3. 78 - 62 + 89 / 49
+
+4. 61 * 93 / 1
+
+5. 51 * 3 * 18
+
+6. 57 + 62 - 12 / 82
+
+7. 2 / 6 + 73 - 25
+
+8. 99 - 68 / 45 - 10 + 46
+
+9. 66 + 72 * 92 / 85
+
+10. 20 / 9 * 35
Author	SHA1	Message	Date
HuQiQiang	3038f7acad	完整实现邮件发送	3 months ago
HuQiQiang	a008aab34c	完整实现邮件发送	3 months ago
HuQiQiang	34dee8490a	初版	3 months ago