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103 lines
3.2 KiB
Markdown
103 lines
3.2 KiB
Markdown
# [1603. Design Parking System](https://leetcode.com/problems/design-parking-system/)
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## 题目
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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.
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Implement the `ParkingSystem` class:
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- `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.
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- `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`.
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**Example 1:**
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```
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Input
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["ParkingSystem", "addCar", "addCar", "addCar", "addCar"]
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[[1, 1, 0], [1], [2], [3], [1]]
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Output
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[null, true, true, false, false]
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Explanation
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ParkingSystem parkingSystem = new ParkingSystem(1, 1, 0);
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parkingSystem.addCar(1); // return true because there is 1 available slot for a big car
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parkingSystem.addCar(2); // return true because there is 1 available slot for a medium car
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parkingSystem.addCar(3); // return false because there is no available slot for a small car
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parkingSystem.addCar(1); // return false because there is no available slot for a big car. It is already occupied.
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```
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**Constraints:**
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- `0 <= big, medium, small <= 1000`
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- `carType` is `1`, `2`, or `3`
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- At most `1000` calls will be made to `addCar`
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## 题目大意
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请你给一个停车场设计一个停车系统。停车场总共有三种不同大小的车位：大，中和小，每种尺寸分别有固定数目的车位。
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请你实现 ParkingSystem 类：
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- ParkingSystem(int big, int medium, int small) 初始化 ParkingSystem 类，三个参数分别对应每种停车位的数目。
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- bool addCar(int carType) 检查是否有 carType 对应的停车位。 carType 有三种类型：大，中，小，分别用数字 1， 2 和 3 表示。一辆车只能停在 carType 对应尺寸的停车位中。如果没有空车位，请返回 false ，否则将该车停入车位并返回 true 。
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## 解题思路
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- 简单题。分别用 3 个变量表示大，中和小车位。`addCar()` 判断这 3 个变量是否还有空车位即可。
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## 代码
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```go
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package leetcode
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type ParkingSystem struct {
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Big int
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Medium int
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Small int
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}
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func Constructor(big int, medium int, small int) ParkingSystem {
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return ParkingSystem{
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Big: big,
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Medium: medium,
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Small: small,
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}
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}
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func (this *ParkingSystem) AddCar(carType int) bool {
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switch carType {
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case 1:
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{
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if this.Big > 0 {
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this.Big--
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return true
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}
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return false
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}
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case 2:
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{
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if this.Medium > 0 {
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this.Medium--
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return true
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}
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return false
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}
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case 3:
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{
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if this.Small > 0 {
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this.Small--
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return true
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}
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return false
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}
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}
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return false
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}
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/**
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* Your ParkingSystem object will be instantiated and called as such:
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* obj := Constructor(big, medium, small);
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* param_1 := obj.AddCar(carType);
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*/
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``` |