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).




import strutils
 
var
  curOut = 0
  maxOut = -1
  maxTimes = newSeq[string]()
 
for job in lines "mlijobs.txt":
  if "OUT" in job: inc curOut else: dec curOut
  if curOut > maxOut:
    maxOut = curOut
    maxTimes.setLen(0)
  if curOut == maxOut:
    maxTimes.add job.split[3]
 
echo "Maximum simultaneous license use is ", maxOut, " at the following times:"
for i in maxTimes: echo "  ", i