1603--design-parking-system.js

//  1603. Design Parking System
//  https://leetcode.com/problems/design-parking-system/
//  Easy
//  
//    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


/**
 * @param {number} big
 * @param {number} medium
 * @param {number} small
 */
var ParkingSystem = function (big, medium, small) {
    this.count = [big, medium, small];
};

/**
 * @param {number} carType
 * @return {boolean}
 */
ParkingSystem.prototype.addCar = function (carType) {
    return this.count[carType - 1]-- > 0;
};

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