Python3 fast and concise (97.54%)
\nclass ParkingSystem:\n    def __init__(self, big: int, medium: int, small: int):\n        self.spaces = {\n            1: big,\n            2: medium,\n      
```\nclass ParkingSystem:\n    def __init__(self, big: int, medium: int, small: int):\n        self.spaces = {\n            1: big,\n            2: medium,\n            3: small\n        }\n\n    def addCar(self, carType: int) -> bool:\n        self.spaces[carType] -= 1\n        return self.spaces[carType] >= 0\n\n# Your ParkingSystem object will be instantiated and called as such:\n# obj = ParkingSystem(big, medium, small)\n# param_1 = obj.addCar(carType)\n```
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