leetcode 1603. 设计停车系统

class ParkingSystem {
public:
    int b, m, s;
    ParkingSystem(int big, int medium, int small)
    {
        b=big;
        m=medium;
        s=small;
    } 
    
    bool addCar(int carType) 
    {
        if (carType == 1) 
        {
            if (b > 0) 
            {
                b--;
                return true;
            }
        } 
        else if (carType == 2) 
        {
            if (m > 0) 
            {
                m--;
                return true;
            }
        } 
        else if (carType == 3) 
        {
            if (s > 0) 
            {
                s--;
                return true;
            }
        }
        return false;
    }
};