I just have to tell you that I have made a problem using polygon. I was just thinking why would not I share it to you guys. Must try to solve it. Please also suggest me what will be the estimated difficulty level of the problem.

https://codeforces.net/contestInvitation/e97581168e2cf5bb05ca773f4dfce2a0eafd1e20

This is a whole contest made in polygon. But to do this problem accept the contest invitation and open the problem:I