I added a generator to a written problem, but I don't know how to use the script (generator-name [parameter] > $) What does this script do exactly ?!

Thanks in advance !

I read and searched about the benefits of educational round hacks blogspecially this section "After the end of the round will be a 24-hour period of open hacks — any visitor of Codeforces may try to hack any complete solution to a problem of the last round (either from a contest, or from practice), the source code of hacking solution is available (you can copy the text and, for example, stress it); All successful hacks from the previous item will be added to the official test set and after as long as 24 hours after the end of the round retesting of all complete solutions will be made;" So does hacking change increases the hacker rate ?

Thanks in advance

i am using "GNU C++ 14" for this submitted code but I got that weird verdict in testcase 2, ( I tested it locally and online here and the result is correct ) so what is that weird verdict??