Thank you so much ) i passed this kata

Fixed

Please post your current solution here (and mark it as a spoiler) so I can review it and perhaps identify the problem, cheers :)

Hey,
I passed all public testcases, but when i press 'attempt" btn, i get SIGSEGV. Maybe someone could help me, what is a reson for this error? So, check for the nullptr list is tested in public testcase.

thanks a lot

Yes, that's it. You have to do the same thing faster, now.

Yes, i had one test-print. Now it works, but i pass only 3 tests ( random-small/medium/large ) and then have "Process was terminated. It took longer than 20000ms to complete
". So, i need to do it faster?
It's interesting, that's why i am doing it :)

might be, too much information printed to the console (do not print anything in this kata when using attempt).

Note: it's 2 kyu kata, and a difficult one to debug because you often have no clue of what's going wrong (just as you're facing now). Are you sure you wanna fight against this one now?

When i press to "attempt" button i get an error exec_failure. What could be a resaon for this and how can i fix it? Sample tests work fine.

Cause StringBuffer is thread-safe and used only if you have multi-threading programm and need synchronisation. So, it's work slower that StringBuilder. In this case there are no reasons to choose StringBuffer, cause we have just one thread.