From: Brian Candler <b.candler@...>
Date: 2010-08-18T18:25:15+09:00
Subject: Re: can i do this in ruby? a simulation process

Josh Cheek wrote:
> For each second, check to 
> see
> if a vehicle should be departing, if so, add it to an array of vehicles 
> in
> transit. And check the array of vehicles in transit to see if a vehicle 
> is
> arriving, if so, remove it from the in transit array, and add its 
> passengers
> to a sum. Then just increment seconds and iterate until >= 500 
> passengers
> have arrived.

You have to be very careful with the termination condition.

Let's say that a car leaves, arrives after 70 seconds, and that brings 
increments your total from 499 to 500.

However it's still possible that another vehicle could leave 5 seconds 
later and arrive after 50 seconds (15 seconds before that car), which 
means the 500 limit is actually reached earlier than you first thought.

Regards,

Brian.
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