Does codeforces tell us our performance rating after contests? If not, is there a way to estimate it?

my submission: https://mirror.codeforces.com/contest/2119/submission/327632426

My code fails on test 2's 1879th token. I do not understand whats wrong with it and how it fails at one particular point even though it seems fine to me. Lots of people failed this problem on test 2. Can someone tell me what's wrong with my code?

Thanks, Ramanav.