Solution.c

typedef struct {
    int* count;
} ParkingSystem;

ParkingSystem* parkingSystemCreate(int big, int medium, int small) {
    ParkingSystem* res = malloc(sizeof(ParkingSystem));
    res->count = malloc(sizeof(int) * 3);
    res->count[0] = big;
    res->count[1] = medium;
    res->count[2] = small;
    return res;
}

bool parkingSystemAddCar(ParkingSystem* obj, int carType) {
    int i = carType - 1;
    if (!obj->count[i]) {
        return 0;
    }
    obj->count[i]--;
    return 1;
}

void parkingSystemFree(ParkingSystem* obj) {
    free(obj);
}

/**
 * Your ParkingSystem struct will be instantiated and called as such:
 * ParkingSystem* obj = parkingSystemCreate(big, medium, small);
 * bool param_1 = parkingSystemAddCar(obj, carType);

 * parkingSystemFree(obj);
*/