I have got a verdict pretest passed on Problem B Codeforces Round #678 (Div. 2) during contest time which has not changed till now, i.e., it has neither got a verdict W/A or AC rather the submission is still showing pretest passed. After the contest, I submitted the same solution again and get AC though the earlier is still showing pretest passed. What can be reason behind? here is a link to my submission: https://mirror.codeforces.com/contest/1436/submission/96571156