The tag game(codeforces)

#1

https://codeforces.com/problemset/problem/813/C

the above link is for one of the question from codeforces. can you tell me the approach to solve this one?

#2

Hey @aditikandhway
Please check the tutorial :https://codeforces.com/blog/entry/52410
Also check this https://programmersought.com/article/81041202802/