错误1：68 7 [Error] no unique final overrider for 'virtual void Account::setCategory(int)' in 'CardSystem' 错误2：75 38 [Error] reference to 'm_category' is ambiguous

#include <iostream>
#include <string>
using namespace std;

// 虚基类，表示一卡通账户
class Account 
{
public:
    Account(string name, int id) : m_name(name), m_id(id) {}
    virtual ~Account() {}
    virtual void printInfo() const {
        cout << "账户名：" << m_name << endl;
        cout << "账户ID：" << m_id << endl;
    }
    virtual void setCategory(int category) = 0; // 设定类别
    virtual double calculateCost(double amount) const = 0; // 计算消费额
protected:
    string m_name; // 账户名
    int m_id; // 账户ID
};

// 普通账户
class NormalAccount :virtual public Account 
{
public:
    NormalAccount(string name, int id) : Account(name, id) {}
    void setCategory(int category) override {
        m_category = category;
    }
    double calculateCost(double amount) const override {
        return amount;
    }
protected:
    int m_category; // 账户类别
};

// 学生账户
class StudentAccount :virtual public Account 
{
public:
    StudentAccount(string name, int id) : Account(name, id) {}
    void setCategory(int category) override {
        m_category = category;
    }
    double calculateCost(double amount) const override {
        return amount * 0.8; // 学生账户打八折
    }
protected:
    int m_category; // 账户类别
};

// 教师账户
class TeacherAccount : virtual public Account 
{
public:
    TeacherAccount(string name, int id) : Account(name, id) {}
    void setCategory(int category) override {
        m_category = category;
    }
    double calculateCost(double amount) const override {
        return amount * 0.9; // 教师账户打九折
    }
protected:
    int m_category; // 账户类别
};

// 一卡通管理系统
class CardSystem : public NormalAccount, public StudentAccount, public TeacherAccount 
{
public:
    CardSystem(string name, int id) : Account(name, id), NormalAccount(name, id), StudentAccount(name, id), TeacherAccount(name, id) {}
    void printInfo() const override 
	{
        Account::printInfo();
        cout << "账户类别：" << m_category << endl;
    }
};

int main() 
{
    CardSystem card("张三", 1001);
    card.setCategory(1);
    double cost = card.calculateCost(100.0);
    cout << "消费金额：" << cost << endl;
    card.printInfo();
    return 0;
}