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).




procedure main(A)
    maxCount := count := 0
 
    every !&input ?  case tab(upto('@')) of {
        "License OUT ": {
             maxTime := (maxCount <:= (count +:= 1), [])
             put(maxTime, (maxCount = count, ="@ ", tab(find(" for "))))
             }
        "License IN  ": count -:= (count > 0, 1)     # Error check
        }
 
    write("There were ",maxCount," licenses out at:")
    every write("\t",!maxTime)
end