A grocery store company is revising its cashier and check-out staffing. The company wants you to develop an object-oriented software simulator to determine if their new policy will meet the needs of both customers and the store.

The store has eight checkout lanes. One lane is always marked "Express: nine items or less," and another is marked "Express: nineteen items or less." Not all checkout lanes are always staffed.

The time taken for a cashier to complete a transaction with a customer depends on:
- The number of items that the customer has.
- Whether the customer is paying by (a) cash, (b) cheque, or (c) debit card.
- A small random factor.

Assume the following:
- It takes a cashier 5 seconds per item.
- It takes a customer 1 minute to pay by cash, 2 minutes to pay by debit card, and 2.5 minutes to pay by cheque.

The time taken for a customer to pass through a checkout lane also depends on how busy the checkout registers are when the customer decides to enter a lane and the time to process the customers ahead in the lane.

The company wants to run the same pattern of customers through various cashier configurations to see what configuration works best. Therefore, they want three separate programs:

1. The first program creates a file specifying the customers for a given simulation. This file should list the customers in the order of their arrival at the checkouts, the number of items that the customer intends to buy, and the method of payment the customer intends to use.

2. The second program creates a file specifying the configuration of cashiers for a given simulation. This file should list when a cashier comes on duty and when the cashier goes off duty. For simplicity, assume that there is a fixed number of cashiers available at any given time and that they are all tending tills.

3. The third program runs a simulation by reading a customer file and a cashier file and simulating and timing the interactions. At a minimum, the third program should measure how often cashiers are idle and how often customers must wait a long time to be served.

Here are some questions you might want to think about:
1. How do you decide when the express check-out lanes are staffed?
2. Can you use a debit card on either of the express lanes?
3. How does a customer choose which lane to stand in?
4. What happens if there is a lineup when cashiers are at the end of their shift?
5. How long does it take for cashiers to switch at a till?

I need this solution in a C++ program.