Plz i want help so fasttttt

#include <iostream>
#include <string>
#include <vector>
#include <fstream>

using namespace std;

bool reading = true;
vector <string> R;
void StringExplode(string str, string separator, vector<string>* results);
void add_user(string emp_name, int w_D, int daily_wage, int dept_id, int dept_id2, string dep_name);
string line;
int i;
struct emp{
       int emp_id;
       string emp_name;
       int w_D;
       int daily_wage;
       int dept_id;
};

struct dept{
       int dept_id;
       string dep_name;
};

emp employee[1000000];
dept department[1000000];
int employees;
string input;
int main(){
    getline(cin, input);
    R.clear();
    StringExplode(input, " ", &R);
    if(R[0] == "add" || R[0] == "ADD"){
            add_user(R[1], atoi(R[2].c_str()), atoi(R[3].c_str()), atoi(R[4].c_str()), atoi(R[5].c_str()), R[6]);
            cout << "Added employee " << R[1] << endl;
    }
    if(R[0] == "view" || R[0] == "VIEW"){
            i = 0;
          fstream saved_r("saved_employees.dat", ios::in | ios::binary);
          cout << "Loading employee list" << endl;
          while(reading == true && saved_r.eof() == false){
                R.clear();
                getline(saved_r, line);
                StringExplode(line, " ", &R);
                if(line.length() > 0){
                      employee[i].emp_id = atoi(R[0].c_str());
                      employee[i].emp_name = R[1];
                      employee[i].w_D = atoi(R[2].c_str());
                      employee[i].daily_wage = atoi(R[3].c_str());
                      employee[i].dept_id = atoi(R[4].c_str());
                      department[i].dept_id = atoi(R[5].c_str());
                      department[i].dep_name = R[6];
                      
                      cout << "Employee id: ";
                      cout << employee[i].emp_id << endl;
                      cout << "Employee name: ";
                      cout << employee[i].emp_name << endl;
                      cout << "Employee workdays: ";
                      cout << employee[i].w_D << endl;
                      cout << "Employee daily wage: ";
                      cout << employee[i].daily_wage << endl;
                      cout << "Employee department id: ";
                      cout << employee[i].dept_id << endl;
                      cout << "Employee department id2: ";
                      cout << department[i].dept_id << endl;
                      cout << "Employee department name: ";
                      cout << department[i].dep_name << endl;
                      cout << "-10% tax: " << (employee[i].w_D * employee[i].daily_wage) - ((employee[i].w_D * employee[i].daily_wage) * 10) / 100;
                      cout << endl;
                      
                 }
          if(line.length() <= 0){
                reading = false;
          }
          line.clear();
          R.clear();
          i++;
    }
    saved_r.close();
    employees = i;
    cout << employees << " Employees" << endl;
    cout << "OK \n";
 }
    system("PAUSE");
    return 0;
}



void StringExplode(string str, string separator, vector<string>* results){
    int found;
    found = str.find_first_of(separator);
    while(found != string::npos){
        if(found > 0){
            results->push_back(str.substr(0,found));
        }
        str = str.substr(found+1);
        found = str.find_first_of(separator);
    }
    if(str.length() > 0){
        results->push_back(str);
    }
    if(str == ""){
           results->push_back("Nothing here");
           results->push_back("Nothing here");
           results->push_back("Nothing here");
           results->push_back("Nothing here");
           results->push_back("Nothing here");
           results->push_back("Nothing here");
           results->push_back("Nothing here");
           results->push_back("Nothing here");
           results->push_back("Nothing here");
           results->push_back("Nothing here");
    }
    if(!found > 0){
              results->clear();
    }
}

void add_user(string emp_name, int w_D, int daily_wage, int dept_id, int dept_id2, string dept_name){
           i = 0;
     fstream saved_w("saved_employees.dat", ios::out | ios::app);
     employees++;
     employee[employees].emp_id = employees;
     employee[employees].emp_name = emp_name;
     employee[employees].w_D = w_D;
     employee[employees].daily_wage = daily_wage;
     employee[employees].dept_id = dept_id;
     department[employees].dept_id = dept_id2;
     department[employees].dep_name = dept_name;
     
     saved_w << employee[employees].emp_id;
     saved_w << " ";
     saved_w << employee[employees].emp_name;
     saved_w << " ";
     saved_w << employee[employees].w_D;
     saved_w << " ";
     saved_w << employee[employees].daily_wage;
     saved_w << " ";
     saved_w << employee[employees].dept_id;
     saved_w << " ";
     saved_w << department[employees].dept_id;
     saved_w << " ";
     saved_w << department[employees].dep_name;
     saved_w << "\n";
     saved_w.close();
     
}
 :rockon: