Error when running but no error on submission

[strang]

For many of the questions that I submit, I always get either a NZEC, SIGTSTP etc error. But if i submit the solution then it is accepted.
I have wasted so much time because of this problem.
Furthermore, I think there is some serious issue with the editor for submitting code.

So is my solution wrong or is there something wrong with the judge?

[ssjgz]

Are you clicking “Run” without providing custom input?

New to Codechef. Can't understand the platform

One thing that trips up all people migrating from Hackerrank (hello :)) is that clicking “Run” (not “Submit”) here on Codechef does not run your code with the sample testcases - instead, it runs it with empty input (so attempts to read anything from stdin will fail, or give weird values). If you click “Run”, you must provide Custom Input.