690. Employee Importance

You are given a data structure of employee information, which includes the employee's unique id, their importance value and their 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 their 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.

 1 class Solution {
 2     public int getImportance(List<Employee> employees, int id) {
 3         int total = 0;
 4         Map<Integer, Employee> map = new HashMap<>();
 5         for (Employee employee : employees) {
 6             map.put(employee.id, employee);
 7         }
 8         Queue<Employee> queue = new LinkedList<>();
 9         queue.offer(map.get(id));
10         while (!queue.isEmpty()) {
11             Employee current = queue.poll();
12             total += current.importance;
13             for (int subordinate : current.subordinates) {
14                 queue.offer(map.get(subordinate));
15             }
16         }
17         return total;
18     }
19 }
20 
21 
22 
23 
24 class Solution {
25     public int getImportance(List<Employee> employees, int id) {
26         Map<Integer, Employee> map = new HashMap<>();
27         for (Employee employee : employees) {
28             map.put(employee.id, employee);
29         }
30         return getImportanceHelper(map, id);
31     }
32     
33     private int getImportanceHelper(Map<Integer, Employee> map, int rootId) {
34         Employee root = map.get(rootId);
35         int total = root.importance;
36         for (int subordinate : root.subordinates) {
37             total += getImportanceHelper(map, subordinate);
38         }
39         return total;
40     }
41 }

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来源： https://www.cnblogs.com/beiyeqingteng/p/14651122.html