As RT can go from $$$(x,y)$$$ to $$$((x+2) \text{ mod } n,y)$$$, if x=0 currently, and $$$n \text{ mod } 2=1$$$, it would require the 2 times you mentioned. However, if $$$x!=0$$$, we need to loop $$$3$$$ times to run an entire cycle throughout a column. An example would be if RT is at $$$(3,0)$$$, with $$$n=5$$$, the following operations would be needed to run through column $$$0$$$:

$$$(3,0)$$$ --> $$$(0,0)$$$ --> $$$(2,0)$$$ --> $$$(4,0)$$$ --> $$$(1,0)$$$ --> $$$(3,0)$$$

I guess Master Oogway's words work again, "There is always something more to learn. Even for a (Legendary Grand) Master" lol.

And despite such issues may be problematic, I think we shouldn't put all the blame onto Um_nik as him doing his videos were for a good cause in teaching programming, just that he may have accidentally posted it early. Additionally, he has already apologised as well and I agree everyone makes mistakes, me included. Hopefully, such issues will be prevented in the future. :)

The observation is correct, but there are also other ways to realize such an observation which will be mentioned in the editorials. Of course there might be alternate solutions that also work, but having this observation does simplify the question a lot and can be done through dp or bfs.

Originally we had a storyline, but it was decided to be removed in the end to improve the task's clarity. The idea came from a few sources. The first one is because the old workplace or "home" of my school's robotics team (I was the captain last year) was next to a turtle pond, and so I have a strong love for turtles :) FYI, each of the teachers having their seats next to the pond were also called turtles with different nicknames for each of them. The second reason was that we liked Master Oogway in the movie Kung Fu Panda, so we thought it would be a good choice to use it as a theme, both silly and inspirational.

We contacted him before the round ended of course.

Happy to hear that you liked F a lot (I wrote it) Thank you very much you have made my day.

Hopefully, I don't get downvoted by saying this... ik this task kinda was a nightmare at first sight for some of you, but hope it was an interesting and insightful task. Hope it wasn't that hard to understand as well, I already tried to draw better graphics for the explanation.

Anyways, we will try to get the editorials out as fast as possible :)

The problem-setting team has acknowledged the issue, and I have already tried my best to contact Um_nik on the issue a while ago to try to remove the video. I also hope the round doesn't get unrated :(

“Your mind is like this water, my friend. When it is agitated (or rickrolled), it becomes difficult to see. But if you allow it to settle, the answer becomes clear.” ~ Master Oogway

You can read this: https://www.geeksforgeeks.org/strongly-connected-components/

Also, even though I know this blog is a 100% prank, pls don't make use of any possible sexual jokes (I might have over thought, but with your past posts I do think that is what you meant).

I told you before the contest XD, like even if its not the easiest div-2 rounds, the tasks are still very interesting and elegant (Go read editorial)

I agree with you!!!!!

As a tester, I can reassure you the tasks are pog. Highly recommend everyone to register. I can also confirm that the first question is QA.

I liked the pictures in the questions, but for QB, adding a pragma after comp ends up ACing.WHY!!!!??? :(