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).




⍝  Copy/paste file's contents into TXT (easiest), or TXT ← ⎕NREAD
       I  ←  TXT[;8+⎕IO]
       D  ←  TXT[;⎕IO+14+⍳19]
       lu ←  +\ ¯1 * 'OI' ⍳ I
       mx ←  (⎕IO+⍳⍴lu)/⍨lu= max ← ⌈/ lu
       ⎕  ←  'Maximum simultaneous license use is ' , ' at the following times:' ,⍨ ⍕max ⋄ ⎕←D[mx;]