690. Employee Importance ---------E

Q:

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.

 

Note:

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

A:

-------------------就是用HashMap ---------记得map[E->id] = E;  而不是map[E->id] = E->importance -------------

/*
// Definition for Employee.
class Employee {
public:
    int id;
    int importance;
    vector<int> subordinates;
};
*/

class Solution {
public:
    int getImportance(vector<Employee*> employees, int id) {
        unordered_map<int,Employee*> map; // id to importance
        for(auto E: employees)
            map[E->id] = E;
        
        unordered_set<int> FoundSet;
        vector<int> V{id};
        int res =0;
        while(! V.empty()){
            int curID = V.back();
            V.pop_back();
            FoundSet.insert(curID);
            res += map.find(curID)->second->importance;
            for(auto tt:  map.find(curID)->second->subordinates){
                V.push_back(tt);
            }
        }
        return res;
    }
};

学到了，

哎， map.find(curID)->second->importance

记得是 ->second