C# Solution Array
\npublic class ParkingSystem {\n    int[] parking;\n    public ParkingSystem(int big, int medium, int small) {\n        parking= new int[]{big, medium, small};\
```\npublic class ParkingSystem {\n    int[] parking;\n    public ParkingSystem(int big, int medium, int small) {\n        parking= new int[]{big, medium, small};\n    }\n    \n    public bool AddCar(int carType) {\n        if(parking[carType-1] != 0){\n            parking[carType-1] -= 1;\n            return true;\n        }\n            \n        return false;\n    }\n}\n```
['Array']