Package g1801_1900.s1845_seat_reservation_manager

Class SeatManager

java.lang.Object
g1801_1900.s1845_seat_reservation_manager.SeatManager
public class SeatManager extends Object
1845 - Seat Reservation Manager\. Medium Design a system that manages the reservation state of `n` seats that are numbered from `1` to `n`. Implement the `SeatManager` class: * `SeatManager(int n)` Initializes a `SeatManager` object that will manage `n` seats numbered from `1` to `n`. All seats are initially available. * `int reserve()` Fetches the **smallest-numbered** unreserved seat, reserves it, and returns its number. * `void unreserve(int seatNumber)` Unreserves the seat with the given `seatNumber`. **Example 1:** **Input** ["SeatManager", "reserve", "reserve", "unreserve", "reserve", "reserve", "reserve", "reserve", "unreserve"] [[5], [], [], [2], [], [], [], [], [5]] **Output:** [null, 1, 2, null, 2, 3, 4, 5, null] **Explanation:** SeatManager seatManager = new SeatManager(5); // Initializes a SeatManager with 5 seats. seatManager.reserve(); // All seats are available, so return the lowest numbered seat, which is 1. seatManager.reserve(); // The available seats are [2,3,4,5], so return the lowest of them, which is 2. seatManager.unreserve(2); // Unreserve seat 2, so now the available seats are [2,3,4,5]. seatManager.reserve(); // The available seats are [2,3,4,5], so return the lowest of them, which is 2. seatManager.reserve(); // The available seats are [3,4,5], so return the lowest of them, which is 3. seatManager.reserve(); // The available seats are [4,5], so return the lowest of them, which is 4. seatManager.reserve(); // The only available seat is seat 5, so return 5. seatManager.unreserve(5); // Unreserve seat 5, so now the available seats are [5]. **Constraints:** * 1 <= n <= 105 * `1 <= seatNumber <= n` * For each call to `reserve`, it is guaranteed that there will be at least one unreserved seat. * For each call to `unreserve`, it is guaranteed that `seatNumber` will be reserved. * At most 105 calls **in total** will be made to `reserve` and `unreserve`.

  • Constructor Details

    • SeatManager

      public SeatManager(int n)

  • Method Details

    • reserve

      public int reserve()

    • unreserve

      public void unreserve(int seatNumber)