I am trying to solve this problem,
I can think of a O(n2) algorithm but its too slow for this problem.
I think some data structure built with trees and linked list should solve this problem
Can anybody give some hints/ideas for this?
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Idea is like in RMQ with group operations.
To do this, you need to store in each vertex additional bool rev - need we to reverse this subtree, or not.
When we try to modify or query some vertex, check this value and if it's true, swap two childs, and <look comment at bottom>