Not Getting a hint to solve this problem

[ojhasaurabh2099 (Saurabh Ojha)]

I am not getting hints to solve this problem. Any hints for this problem is appreciated.

Link:
https://www.codechef.com/MAY19B/problems/WTBTR

[Anubhav-Aron-1353657628083250 (Anubhav Aron)]

Solved on WhatsApp personal.