A company currently pays a fixed sum for the use of a particular licensed software package.   In determining if it has a good deal it decides to calculate its maximum use of the software from its license management log file.

Assume the software's licensing daemon faithfully records a checkout event when a copy of the software starts and a checkin event when the software finishes to its log file.

An example of checkout and checkin events are:

 License OUT @ 2008/10/03_23:51:05 for job 4974
 ...
 License IN  @ 2008/10/04_00:18:22 for job 4974



Task

Save the 10,000 line log file from    here   into a local file, then write a program to scan the file extracting both the maximum licenses that were out at any time, and the time(s) at which this occurs.

Mirror of log file available as a zip here (offsite mirror).




 
@(bind *times* #H((:eql-based) nil))
@(bind *licenses-out* 0)
@(bind *maximum-licenses-out* 0)
@(collect)
License @statuses @@ @dateTimes for job @jobNumbers
@(end)
@(do (each ((status statuses)
             (dateTime dateTimes)
             (jobNumber jobNumbers))
       (set *licenses-out*
         (if (equal status "OUT")
           (progn 
             (when (>= (+ *licenses-out* 1) *maximum-licenses-out*)
               (set *maximum-licenses-out* (+ *licenses-out* 1))
               (pushhash *times* *maximum-licenses-out* dateTime))
             (+ *licenses-out* 1))
           (+ *licenses-out* -1)))))
@(output)
Maximum # of licenses out: @{*maximum-licenses-out*}
Peak time(s): @{(reverse (gethash *times* *maximum-licenses-out*))}
@(end)
 