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help with a question in a recent contest at CODECHEF JUNE Lunchtime 2020
problem: https://www.codechef.com/LTIME85A/problems/COWSHEDS
I was able to solve it when the constraints are less, how to solve it efficiently? Editorial for this question hasn't been released yet. So, it would be of great help if you could explain your approach and key concepts along with the solution.
