The call_stat.txt file contains information about mobile subscriber calls. It has the following structure: subscriber_id1 subscriber_id2 duration_sec.
Subscriber ids are String, and duration is Int. For example:
sub1 sub2 72
sub2 sub1 35
Find all the calls that lasted more than 60 seconds and print the corresponding subscriber_id1 to the console. Call duration in the file is given in seconds.
Construct a program that solves the problem. Use single point for tabulation. Three closing curly brackets are collapsed together for simplicity. No need to use tabulation before them.