Please help me! Can't find out what exaclty is wrong with this code?!

[vedlabura]

This is my code for the problem RBTREES.
https://www.codechef.com/viewsolution/37128058
Its passing all my test cases but online judge says wrong answer. I have no idea what is wrong. It’s probably something very simple but I can’t seem to find out what it is!

I have used the same logic as the editorial one.

RBTREES - Editorial

PROBLEM LINK: Practice Contest Setter: Vikas Pandey Tester: Rahul Dugar Editorialist: Ishmeet Singh Saggu DIFFICULTY: Easy-Medium PREREQUISITES: DFS, Greedy and Bipartite Graph PROBLEM: In a red-blue tree , each vertex is either red or blue, and adjacent vertices always have different colors. You are given a tree with N vertices. The nodes of the tree are colored in either red or blue. You can swap the color of any two adjacent nodes. You have to make the given tree into a red-blue tree …