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).




nOut,maxOut,maxTimes:=0,-1,List();
foreach job in (File("mlijobs.txt")){
   _,status,_,date:=job.split();
   nOut+=( if(status.toUpper()=="OUT") 1 else -1 );
   if(nOut>maxOut){ maxOut=nOut; maxTimes.clear(); }
   if(nOut==maxOut) maxTimes.append(date);
}
println(("Maximum simultaneous license use is %d at"
         " the following times:\n %s").fmt(maxOut,maxTimes.concat("\n")));