So I've filtered all the hacked submissions in the round, and I've noticed something strange: https://mirror.codeforces.com/contest/1772/submission/185895220 https://mirror.codeforces.com/contest/1772/submission/185894048 https://mirror.codeforces.com/contest/1772/submission/185892176 https://mirror.codeforces.com/contest/1772/submission/185890581 https://mirror.codeforces.com/contest/1772/submission/185890587 https://mirror.codeforces.com/contest/1772/submission/185888246 https://mirror.codeforces.com/contest/1772/submission/185888258 https://mirror.codeforces.com/contest/1772/submission/185887838 https://mirror.codeforces.com/contest/1772/submission/185868906

All these submissions have something in similar: if t == 1/2, it will automatically exit, causing it to be hacked