Help!!!

Hello. I need help on how to start this function. I know I need to use a cout to print out the PIN but I am not sure how to start the rest of it. Here is the problem:

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#include <vector>

#include <iostream>

using namespace std;

// prototype

bool samePIN(vector<int> & customerPIN, vector<int> & databasePIN);

void writePIN(vector<int> & pin); // You must define the function below

int main()

{

	const int NUM_DIGITS = 7;

	vector<int> pin1 = { 2, 4, 1, 8, 7, 9, 0 };

	vector<int> pin2 = { 2, 4, 6, 8, 7, 9, 0 };

	vector<int> pin3 = { 1, 2, 3, 4, 5, 6, 7 };

	if (samePIN(pin1, pin2))

		cout << "Error: pin1 and pin2 report to be the same.\n";

	else

		cout << "SUCCESS: pin1 and pin2 are different.\n";

	if (samePIN(pin1, pin3))

		cout << "Error: pin1 and pin3 report to be the same.\n";

	else

		cout << "SUCCESS: pin1 and pin3 are different.\n";

	if (samePIN(pin1, pin1))

		cout << "Error: pin1 and pin1 report to be the same.\n";

	else

		cout << "SUCCESS: pin1 and pin1 are different.\n";

	return 0;

}



// Return TRUE if PINs are different

// Return FALSE if the PINs are the same

bool samePIN(vector<int> & customerPIN, vector<int> & databasePIN)

{

	if (customerPIN.size() != databasePIN.size())

		return false; // different in sizes

	int length = customerPIN.size();

	for (int i = 0; i < length; ++i)

	{

		if (customerPIN[i] != databasePIN[i])

			return false;

	}

	return true;

}



void writePIN(vector<int> & pin)

{
	
	/*

	Your function must iterate through the PIN vector such that the

	PIN is printed out enclosed in square brackets as follows:

	[2 4 1 8 7 9 0]

	There is a single space between each digit but no space after the last digit

	*/

}


Any help is appreciated! Thank you!
Here, check this thread out:

http://www.cplusplus.com/forum/general/142342/
This didn't help me because this is what the program started out as before my professor changed it... thank you though!
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