This is my personal note and might be some kind of user editorial/learning material for some people!
This is the first episode of this "note" series. I will write notes on problems (normally around 2400-ish problems), which are completely solved by myself without looking at the editorial, that are both interesting and educational.
If you want to motivate me to write a continuation (aka note 2), a significant upvote from you would be well appreciated!
Problem link: ABC133F
Try to solve the task independently before continuing the blog.
That reduces the problem to O(N2), lets optimize it!
This allows an O(NlogN) solution
Feel free to ask anything about the task. I will try to respond them if I am free.