Package g1301_1400.s1376_time_needed_to_inform_all_employees

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    1376 - Time Needed to Inform All Employees.

    Medium

    A company has n employees with a unique ID for each employee from 0 to n - 1. The head of the company is the one with headID.

    Each employee has one direct manager given in the manager array where manager[i] is the direct manager of the i-th employee, manager[headID] = -1. Also, it is guaranteed that the subordination relationships have a tree structure.

    The head of the company wants to inform all the company employees of an urgent piece of news. He will inform his direct subordinates, and they will inform their subordinates, and so on until all employees know about the urgent news.

    The i-th employee needs informTime[i] minutes to inform all of his direct subordinates (i.e., After informTimei minutes, all his direct subordinates can start spreading the news).

    Return the number of minutes needed to inform all the employees about the urgent news.

    Example 1:

    Input: n = 1, headID = 0, manager = -1, informTime = 0

    Output: 0

    Explanation: The head of the company is the only employee in the company.

    Example 2:

    Input: n = 6, headID = 2, manager = 2,2,-1,2,2,2, informTime = 0,0,1,0,0,0

    Output: 1

    Explanation: The head of the company with id = 2 is the direct manager of all the employees in the company and needs 1 minute to inform them all.

    The tree structure of the employees in the company is shown.

    Constraints:

    • <code>1 <= n <= 10<sup>5</sup></code>

    • 0 &lt;= headID &lt; n

    • manager.length == n

    • 0 &lt;= manager[i] &lt; n

    • manager[headID] == -1

    • informTime.length == n

    • 0 &lt;= informTime[i] &lt;= 1000

    • informTime[i] == 0 if employee i has no subordinates.

    • It is guaranteed that all the employees can be informed.

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Integer numOfMinutes(Integer n, Integer headID, IntArray manager, IntArray informTime)

      • Methods inherited from class java.lang.Object

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