Hey. In this post I`d like to give some tasks on centroid decomposition.
There`re useful links below
https://neerc.ifmo.ru/wiki/index.php?title=Centroid_decomposition
https://mirror.codeforces.com/blog/entry/73707
Also some tasks on this topic
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Why do you think that these problems are useful if you didn't upsolve them?
To my mind at least half of problems are from this blog https://mirror.codeforces.com/blog/entry/52492?locale=ru. I think that topovik did ugly when he just copied these problems while other guy spent time to find and collect them.
Sure :)