Issues Regarding Game of Tic-Tac-Toe Again?

Dear all,

In the recently concluded NSU Cybernauts Programming Contest, we encountered an issue in our problem “Game of Tic-Tac-Toe Again?” Both the judge and the alternate solutions of this problem were incorrect. Despite our relentless efforts to create high quality problems, mistakes do take place and we sincerely want to apologize from our side.

We had some accepted submissions for this problem during the contest. Since we encourage keeping accepted verdicts unchanged, we kept them as they were. We have re-implemented our solutions, updated the dataset and run all the negative verdicts with our updated data. I would like to thank Jubayer Rahman Nirjhor for helping us finding the solution for this problem.

The setter of this problem has written a tutorial of this problem. Hope it will help. Here it goes: