Hello, Codeforces community!

I am working on a new problem and would love your help in coming up with an idea for it. I am looking for problems of medium difficulty, roughly between 1500 and 2000. An important condition: the problem should be solvable using binary search. If you have interesting and creative problem ideas, please share them in the comments.

Ideas may include:

Description of the situation or problem

Constraints

Examples of input and output

Thank you!