POI 2011 - Tree Rotations submission link is currently broken.

[vietanh2131]

As it is, the link https://oj.uz/problem/view/POI11_rot is currently returning a 404 error.

[bqi343]

doesn't look like this is going to be fixed in oj.uz, try https://szkopul.edu.pl/problemset/problem/sUe3qzxBtasek-RAWmZaxY_p/site/?key=statement instead