Hi everyone.

As the picture describes me, I will tell you the story why I'm sad :(

I participated in the 847th round, and after the end of the system test, I received this message from the system.

Yes, the solutions match up pretty well, but not because we cheated.

The problem was too standard and everyone calls it Xenia and Tree 2. I have Xenia and Tree as a reference problem for Centroid Decomposition.

Anyway, I (it turned out we) copied neal's solution and changed what needed to be changed.

Here is my solution vs neal's solution

As you see the code was written and published/distributed before the start of the round.

The reason why I'm posting too late is the rate rollback issue, I was hoping to get my rate back after I commented this comment.

It's not fair that I got skipped and some people who really cheat didn't get.

I didn't cheat... I know it can be solved with CD..... I didn't share my code with any person... I didn't use ideone or any other online compiler... I don't know these guys... I love codeforces... and I love shawarma...

so please MikeMirzayanov take a look at this. hope you say "The punishment will be reverted." :(