I think they are cheated↵
https://mirror.codeforces.com/contest/1850/submission/214920611;↵
https://mirror.codeforces.com/contest/1850/submission/214917143;↵
https://mirror.codeforces.com/contest/1850/submission/214868771;↵
https://mirror.codeforces.com/contest/1850/submission/214868771↵
and more↵
[user:SlavicG,2023-07-22]
https://mirror.codeforces.com/contest/1850/submission/214920611;↵
https://mirror.codeforces.com/contest/1850/submission/214917143;↵
https://mirror.codeforces.com/contest/1850/submission/214868771;↵
https://mirror.codeforces.com/contest/1850/submission/214868771↵
and more
[user:SlavicG,2023-07-22]