Design Parking System LeetCode solution in C++

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class ParkingSystem {
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 public:
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  vector<int> vehicle;
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 public:
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  ParkingSystem(int big, int medium, int small) {
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    vehicle = {big, medium, small};
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  }
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  bool addCar(int carType) {
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    return vehicle[carType - 1]-- > 0;
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  }