I Tried to find online but didn’t got any material, So any one can tell what is the time limit for execution of code. Or they just check if output is correct?
No, you just need to produce the output in 6 min in your local machine. They aren’t going to run your code. You can refer this discussion if you’ve any more doubts.
Facebook hackercup is really weird man. They ask for output and also for code. Do they really check if my code produces the output?
No. They will not check.
They dont. But your source code should be able to produce correct output. Otherwise (if someone reports that output you submitted wasnt produced by what you have submitted) you will be disqualified.
They uses your code for Plagiarism detection.