DO NOT use AI (or other machine tools) to translate your problem and/or solution. If you can't write in English, you cannot host a round on Codeforces. How will you answer hundreds of clarifications during the round?

The proposal system doesn't support TeX (it's weird, but we'll have to work with what we have). Do not spam a lot of TeX. \left( a + b \right) is so much worse than (a+b). Even n <= 1e5 is better than n \le 10^5.

If you open a proposal for review, it must have a solution. It doesn't matter if I can solve the problem or not, I need to make sure that you know how to solve the problem. If the solution is so obvious that it seems like a waste of time to write it: a) it shouldn't take much time then; b) should you propose this problem in the first place?

Write the complexity of your solution.

Write the limitations on all major parameters in the problem.