Codeforces (342E) Xenia and Tree

help
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1

Hi, can anyone please help me debug this code for Problem E.

link to my code

It has been days and I’ve not been able to find the error.

I used ‘Centroid Decomposition’.

Thanks in Advance!

2

See if this helps:

https://codeforces.com/contest/342/submission/33313188

3

I know this approach. I want to know the mistake in my code.