I do not know who zdiv1 is, but I randomly received a message from them giving the "solution" to problem F as a "gift". This was during Spectral::Cup 2026 Round 1 (Codeforces Round 1094, Div. 1 + Div. 2). I did not continue with problem F after receiving the message and blocked the user afterwards. Unsure what to do next.

UPD: After getting banned, he made another account as yangleak_. Thought this was ragebait at first, looks like he's dead serious about "helping".