LeetCode 1603. Design Parking System

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class ParkingSystem {
private:
    int b, m, s;
public:
    ParkingSystem(int big, int medium, int small): b(big), m(medium), s(small) {
    }
    bool addCar(int carType) {
        switch (carType) {
            case 1:
                return b-- > 0;
            case 2:
                return m-- > 0;
            case 3:
                return s-- > 0;
        }
        return false;
    }
};
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class ParkingSystem {
private:
    int counts;
public:
    ParkingSystem(int big, int medium, int small) {
        counts = (small << 20) | (medium << 10) | big;
    }
    bool addCar(int carType) {
        int bits = (carType - 1) * 10;
        if ((counts >> bits) & 0b1111111111) {
            counts -= 1 << bits;
            return true;
        }
        return false;
    }
};