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redefinition; different basic types error

user056 (19)
A parking garage charges a $2.00 minimum fee to park for up to three hours. The garage charges an additional $0.50 per hour for each hour or part thereof in excess of three hours. The maximum charge for
any given 24-hour period is $10.00. People who park their cars for longer than 24 hours will pay $8.00 per day.
Write a program that calculates and prints the parking charges. The inputs to your program are the date and time when a car enters the parking garage, and the date and time when the same car leaves the parking garage. Both inputs are in the format of
YY/MM/DD hh:mm

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#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <cmath>
#include <algorithm>
#include <sstream>
using namespace std;

string startDateString;
string endDateString;
string dateStr;
int std:: cin;
int parseDate( std::string dateStr );


#include <stdlib.h>
#include <string>
#include <iostream>


int main ()

{
int line;
string enter_date;
string enter_time;
string exit_date;
string exit_time;
cout << "Please enter the date and time the car is entering "<< endl
	<< "the parking garage in the following format: YY/MM/DD hh:mm"<< endl;
getline (cin,line);//cin >> enter_date >> enter_time;

cout<< "Please enter the date and time the car is exiting "<< endl
	<< "the parking garage in the following format: YY/MM/DD hh:mm"<< endl;
getline (cin,line);//cin >> exit_date >> exit_time;


{
    // Format: YY/MM/DD hh:mm
    int year  = atoi( dateStr.substr( 0, 2 ).c_str() );
    int month = atoi( dateStr.substr( 3, 2 ).c_str() );
    int day   = atoi( dateStr.substr( 6, 2 ).c_str() );
    int hour  = atoi( dateStr.substr( 9, 2 ).c_str() );
    int min   = atoi( dateStr.substr( 12, 2 ).c_str() );

    // Now calculate no. of mins and return this
    int totalMins = 0;
    totalMins += ( year * 365 * 24 * 60 ); 
    totalMins += ( month * 30 * 24 * 60 ); 
    totalMins += ( day * 24 * 60 );        
    totalMins += ( hour * 60 );
    totalMins += ( min );

    return totalMins;
}
int startTime = parseDate( startDateString );
int endTime   = parseDate( endDateString );
int elapsedTime = endTime - startTime; // elapsedTime is no. of minutes parked

return 0;
}
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