Package g0801_0900.s0855_exam_room

Class ExamRoom

java.lang.Object
g0801_0900.s0855_exam_room.ExamRoom
public class ExamRoom extends java.lang.Object
855 - Exam Room.

Medium

There is an exam room with n seats in a single row labeled from 0 to n - 1.

When a student enters the room, they must sit in the seat that maximizes the distance to the closest person. If there are multiple such seats, they sit in the seat with the lowest number. If no one is in the room, then the student sits at seat number 0.

Design a class that simulates the mentioned exam room.

Implement the ExamRoom class:

  • ExamRoom(int n) Initializes the object of the exam room with the number of the seats n.
  • int seat() Returns the label of the seat at which the next student will set.
  • void leave(int p) Indicates that the student sitting at seat p will leave the room. It is guaranteed that there will be a student sitting at seat p.

Example 1:

Input [“ExamRoom”, “seat”, “seat”, “seat”, “seat”, “leave”, “seat”] [[10], [], [], [], [], [4], []]

Output: [null, 0, 9, 4, 2, null, 5]

Explanation:

 ExamRoom examRoom = new ExamRoom(10);
 examRoom.seat(); // return 0, no one is in the room, then the student sits at seat number 0. 
 examRoom.seat(); // return 9, the student sits at the last seat number 9. 
 examRoom.seat(); // return 4, the student sits at the last seat number 4. 
 examRoom.seat(); // return 2, the student sits at the last seat number 2. 
 examRoom.leave(4); 
 examRoom.seat(); // return 5, the student sits at the last seat number 5.

Constraints:

  • 1 <= n <= 109
  • It is guaranteed that there is a student sitting at seat p.
  • At most 104 calls will be made to seat and leave.

  • Constructor Summary

    Constructors
    Constructor
    Description
    ExamRoom()
     
    ExamRoom(int n)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    leave(int p)
     
    int
    seat()
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • ExamRoom

      public ExamRoom()

    • ExamRoom

      public ExamRoom(int n)

  • Method Details

    • seat

      public int seat()

    • leave

      public void leave(int p)