Hi,
Background: I am good at Maths but I am weak at Combinatorics, Probability.
Problem: C of Educational Codeforces Round 50
I am unable to understand the combinatorics solution of Editorial. Can somebody help me to understand the solution given in the editorial.
I am unable to understand the problem, Can some help me in this regard?
Problem was long that is why I have attached the link.
Do I need to count the different shapes of the tree?
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