1603.Design Parking System
===

###### tags: `Easy`,`Design`,`Counting`

[1603. Design Parking System](https://leetcode.com/problems/design-parking-system/)

### 題目描述

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`.

### 範例

**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`

### 解答
#### Javascript

class ParkingSystem {
  constructor(big, medium, small) {
    this.empty = [0, big, medium, small];
  }

  addCar(carType) {
    if (this.empty[carType] > 0) {
      this.empty[carType]--;
      return true;
    }

    return false;
  }
}

> [name=Marsgoat][time=May 29, 2023]

#### Python

class ParkingSystem:

    def __init__(self, big: int, medium: int, small: int):
        self.carTypes = [0, big, medium, small]

    def addCar(self, carType: int) -> bool:
        self.carTypes[carType] -= 1
        return self.carTypes[carType] >= 0

> [name=Ron Chen][time=Mon, May 29, 2023]

#### C#

public class ParkingSystem {
    private readonly int[] slots;

    public ParkingSystem(int big, int medium, int small) {
        slots = new int[4] {0, big, medium, small};
    }
    
    public bool AddCar(int carType) {
        if (slots[carType] > 0) {
            slots[carType] -= 1;
            return true;
        }
        return false;
    }
}

> [name=Jim][time=Mon, May 29, 2023]
### Reference

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