I'M PRETTY SURE I FOUND THAT OUT. HIS RATING CHART HAS A RATHER BIZARRE TWIST AT SEP2021 VS JUL 2022! HE COULDN'T SOLVE PROBLEM C IN EDUCATIONAL CODEFORCES ROUND 131 (RATED FOR DIV. 2) AND HE SOLVED D IN CODETON!!! HE IS DEFINITELY A DISGRACEFUL SCAM ARTIST!!! PLEASE BAN HIM!!! HE EVEN GOT RANK29 IN CODEFORCES ROUND #810 (DIV. 2) ！！！！！ THIS IS CRAZY ！！！！ MUST BE BANNED!!!