DesignParkingSystem.ts

// Source : https://leetcode.com/problems/design-parking-system/
// Author : squxq
// Date   : 2023-11-04

/*****************************************************************************************************
 *
 * 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
 ******************************************************************************************************/

export class ParkingSystem {
  parking: [number, number, number];
  constructor(big: number, medium: number, small: number) {
    this.parking = [big, medium, small];
  }

  addCar(carType: number): boolean {
    return !(this.parking[carType - 1]-- < 1);
  }
}

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