纯新手学习语法糖，装*用，没啥实际用途

C++ 代码

using namespace std;

class ParkingSystem {
private:
    int car[4];
public:
    ParkingSystem(int big, int medium, int small) {
        car[1] = big; car[2] = medium; car[3] = small;//建议分开写
    }

    bool addCar(int carType) {
        return car[carType]-- >0;
    }
};

引入头文件会浪费10ms时间！！！