It would be nice if people who have solved the problems could add some hints to the problems they have solved. You can find samples of hints in the Competitive Programming community.
Problems are hosted on Kattis
This problem is from ACM Southwestern European Regional Contest, Paris 2003
This problem belongs to the problem set of Samara University ACM ICPC 2016-2017 Quarterfinal Qualification Contest.
A couple of hints to the problem(Codeforces) would be highly appreciated.
How did mobius treap fare in the WF-2017?
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