Explanation for GERALD2(November challenge 2013)

Hi,

Could anyone please provide an explanation/solution for this problem as editorials were not provided for this problem and I cant seem to decipher the solutions.

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You need to learn heavy light decomposition.

http://ipsc.ksp.sk/2009/real/solutions/l.html

http://wcipeg.com/wiki/Heavy-light_decomposition

That’s not an explanation of the solution. I already wrote before, that just saying it needs HLD is practically useless with a problem of this level.

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