_690.java

package com.fishercoder.solutions;

import com.fishercoder.common.classes.Employee;

import java.util.List;
import java.util.stream.Collectors;

/**
 * 690. Employee Importance
 *
 * You are given a data structure of employee information, which includes the employee's unique id,
 * his importance value and his direct subordinates' id.
 * For example, employee 1 is the leader of employee 2, and employee 2 is the leader of employee 3.
 * They have importance value 15, 10 and 5, respectively.
 * Then employee 1 has a data structure like [1, 15, [2]], and
 * employee 2 has [2, 10, [3]], and employee 3 has [3, 5, []].
 * Note that although employee 3 is also a subordinate of employee 1, the relationship is not direct.
 * Now given the employee information of a company, and an employee id,
 * you need to return the total importance value of this employee and all his subordinates.

 Example 1:

 Input: [[1, 5, [2, 3]], [2, 3, []], [3, 3, []]], 1
 Output: 11
 Explanation:
 Employee 1 has importance value 5, and he has two direct subordinates: employee 2 and employee 3.
 They both have importance value 3. So the total importance value of employee 1 is 5 + 3 + 3 = 11.

 Note:

 One employee has at most one direct leader and may have several subordinates.
 The maximum number of employees won't exceed 2000.

 */
public class _690 {

    public static class Solution1 {

        int total = 0;

        public int getImportance(List<Employee> employees, int id) {
            Employee manager = employees.stream().filter(e -> e.id == id).collect(Collectors.toList()).get(0);
            total += manager.importance;
            manager.subordinates.forEach(subId -> getImportance(employees, subId));

            /**The above line is equivalent to below for loop*/
//            for (int subId : manager.subordinates) {
//                getImportance(employees, subId);
//            }

            return total;
        }

    }
}