Write a simulation program of the lines at a grocery store. The program will be similar to the car wash simulation, except that there are multiple queues instead of one. You might use an array (or vector) of queues to simulate the lines. Assume that there are five cashier lines at the grocery store. Customers enter randomly to check out, and then enter the shortest line. If the lines are equal, then the first available line is chosen. Each transaction takes a random amount of time to complete.

For additional work, expand the grocery line program to allow shoppers to:

• Avoid a line if all lines are a certain length

• Leave a line if they have waited beyond a certain time

• Check if another line is shorter at specified time intervals

• Switch lines if another line is shorter