Type like pro


Find longest interviewer chain

Find longest interviewer chain


In an organization employees are interviewed with one or more previous employees. Those previous employees are also interviewed by some other employees during their joining. In this way an interview chain is formed, where every node in the chain has been interviewed by the next node in the chain. You are given such information of interviewers for every employees. Given any employee in the organization find the longest such chain possible.


Every employee maintains a list of interviewers. We recursively find the longest chain. We call the same function to find the longest chain of all of its interviewers. Whichever path has the highest length, we append the current employee to that list and return. If the employee has no interviewers then the recursion ends there and we return a single element list which contain only that particular employee. 


import java.util.ArrayList;
import java.util.List;

public class InterviewHierarchy
 public static void main(String[] args)
  Employee ceo = new Employee("ceo");
  Employee director1 = new Employee("director1");
  Employee director2 = new Employee("director2");
  Employee director3 = new Employee("director3");
  Employee manager1 = new Employee("manager1");
  Employee manager2 = new Employee("manager2");
  Employee manager3 = new Employee("manager3");
  Employee employee1 = new Employee("employee1");
  Employee employee2 = new Employee("employee2");
  Employee employee3 = new Employee("employee3");

  List result = findLongestInterviewChain(employee2);
  System.out.println("Longest interview chain of " + employee2.getName());
  for (Employee employee : result)
   System.out.print(employee.getName() + ", ");

 private static List findLongestInterviewChain(Employee employee)
  int maxLength = -1;
  List longestPath = new ArrayList();
  for (Employee interviewer : employee.getInterviewers())
   List path = findLongestInterviewChain(interviewer);
   if (path.size() > maxLength)
    maxLength = path.size();
    longestPath = path;
  longestPath.add(0, employee);
  return longestPath;

 private static class Employee
  private List interviewers;
  private String name;

  public Employee(String name)
   this.name = name;
   interviewers = new ArrayList();

  public String getName()
   return name;

  public List getInterviewers()
   return interviewers;

  public Employee addInterviewer(Employee employee)
   return this;