kill process

void fill_res (vector <int> &res, int kill, unordered_map <int , vector <int> > &parent_p )
    {
        if (parent_p.count(kill) > 0)
        {
            for (int i = 0 ;  i < parent_p[kill].size(); i++)
            {
                int cur = parent_p[kill][i];
                res.push_back (cur);
                fill_res (res, cur, parent_p);
            }
        }

    }
    vector<int> killProcess(vector<int>& pid, vector<int>& ppid, int kill) {

        unordered_map <int , vector <int> > parent_p;
        vector <int> res;
        res.push_back(kill);

        for (int i = 0 ; i < ppid.size(); i++)
        {
            int cur = ppid[i];
            parent_p[cur].push_back(pid[i]);
        }



        fill_res (res, kill, parent_p);

        return res;
    }