1603. Design Parking System

Design a parking system for a parking lot. The parking lot has three kinds of parking spaces: big, medium, and small, with a fixed number of slots for each size.

Implement the ParkingSystem class:

ParkingSystem(int big, int medium, int small) Initializes object of the ParkingSystem class. The number of slots for each parking space are given as part of the constructor.
bool addCar(int carType) Checks whether there is a parking space of carType for the car that wants to get into the parking lot. carType can be of three kinds: big, medium, or small, which are represented by 1, 2, and 3 respectively. A car can only park in a parking space of its carType. If there is no space available, return false, else park the car in that size space and return true.
 

Example 1:

Input
["ParkingSystem", "addCar", "addCar", "addCar", "addCar"]
[[1, 1, 0], [1], [2], [3], [1]]
Output
[null, true, true, false, false]

Explanation
ParkingSystem parkingSystem = new ParkingSystem(1, 1, 0);
parkingSystem.addCar(1); // return true because there is 1 available slot for a big car
parkingSystem.addCar(2); // return true because there is 1 available slot for a medium car
parkingSystem.addCar(3); // return false because there is no available slot for a small car
parkingSystem.addCar(1); // return false because there is no available slot for a big car. It is already occupied.
 

Constraints:

0 <= big, medium, small <= 1000
carType is 1, 2, or 3
At most 1000 calls will be made to addCar

这题按题意就行了，没什么难度。

class ParkingSystem {
public:
    ParkingSystem(int big, int medium, int small) {
        bigSlots = big; mediumSlots = medium; smallSlots = small;
    }
    
    bool addCar(int carType) {
        switch (carType) {
        case 1:
            return bigSlots-- > 0;
        case 2:
            return mediumSlots-- > 0;
        case 3:
            return smallSlots-- > 0;
        }
        return false;
    }

    int bigSlots;
    int mediumSlots;
    int smallSlots;
};

/** * Your ParkingSystem object will be instantiated and called as such: * ParkingSystem* obj = new ParkingSystem(big, medium, small); * bool param_1 = obj->addCar(carType); */