From: brabuhr@...
Date: 2010-08-19T02:28:05+09:00
Subject: Re: can i do this in ruby? a simulation process

On Wed, Aug 18, 2010 at 11:47 AM, Bruce Wayner <winshocker@gmail.com> wrote:
> i already erase some codes: but the thing is how can i get the total
> number of seconds every time vehicle arrive in the second city.
>
> Example:
> Vehicle Number 1:
> Departure Time: 3 seconds
> Travel Time: 45seconds
> # of people transfer: 1
> Total Time Consume: 48 --> how can get that one

For any given vehicle:
arrival_time = departure_time + travel_time

If I read your problem statement correctly, what you are being asked
for is the arrival time of the last vehicle (well, arrival time of the
vehicle that has arrived-passenger number 500)

> Here is my code which i delete some stuff to make it little:
> print "Number of Vehicle: " #That will be maximum of 5 only
> n = gets().to_i
>
> print "\n Vehicle number 1: "
>  $delay1 = rand(4)
>  $delay2 = rand(10)
>  $depart = rand(36)
>  $travelTime= rand(71)
>  $ET = $depart
>  $ET1= $travelTime
>  $delay1 +=1
>  sleep($delay1)
>  sleep($delay2)
>  $passenger2= 1
>  $delay101 = rand(10)
>  puts ("\nDeparture Time:  #$ET seconds");
>  puts ("Traveling Time:  #$ET1 seconds");
>  puts ("# of passenger Arrive in Second City: #{$passenger2}");
>  puts ("Total Traveling Time:     #{$delay1} seconds");
>  $i = 1+1;
>  $num = n+1;

Remove this whole vehicle 1 thing and just start the loop w/ i set to 1:

>  while $i < $num  do
>
>  puts ("\n Vehicle number: #{$i}");
>  $i +=1;
>
>  $depart1 = rand(36)
>  $travelTime1 = rand(71)
>  $ET = $depart1
>  $ET1= $travelTime1

What are ET and ET1 intended to be?

>  $passenger1=2
>     puts ("\nDeparture Time:  #$depart seconds");
>     puts ("Traveling Time:  #$travelTime1 seconds");
>    puts ("# of people Arrive in second city: #{$passenger1}");
>    puts ("Total Traveling Time:  #$totalTravel");

You never increment $totalTravel; it could be something like
"$totalTravel += $travelTime1".  Though that would not be the value
your problem statement asked for.

Consider the vehicle 1 leaves at time 0 and takes 30 seconds and
vehicle 2 leaves at time 15 and takes 30 seconds.  Adding the travel
times together would give a total time of 60 seconds.  However, both
vehicles were on the road at the same time, so the actual time taken
to deliver the passengers was 45 seconds.

>  end

More importantly, in the loop you do not keep a running total of
arrived passengers.  Then, the loop should be keyed off of number of
arrived passengers instead of number of vehicles.

>  puts("# of people transfer:");
>  puts("Total Time:");