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).




var file_system = new ActiveXObject("Scripting.FileSystemObject");
var fh = file_system.openTextFile('mlijobs.txt', 1); // 1 == open for reading
var in_use = 0, max_in_use = -1, max_in_use_at = [];
 
while ( ! fh.atEndOfStream) {
    var line = fh.readline();
    if (line.substr(8,3) == "OUT") {
        in_use++;
        if (in_use > max_in_use) {
            max_in_use = in_use;
            max_in_use_at = [ line.split(' ')[3] ];
        }
        else if (in_use == max_in_use)
            max_in_use_at.push( line.split(' ')[3] );
    }
    else if (line.substr(8,2) == "IN") 
        in_use--;
}
 
fh.close();
 
WScript.echo("Max licenses out: " + max_in_use + "\n  " + max_in_use_at.join('\n  '));