I participated in CodeTON Round7 last November. I have some questions about CodeTON Round.

1. According to the wallet, I received the Prize in December, but I am sure that I only saw this transfer from December last year in February 2024. Later, I participated in the 2024 CodeTON Round8. I want to know how long it will take for me to get my Prize? Why are my transfers "delayed"?

2. My friend CodeTON also filled in my wallet address after Round 8 (because they didn’t understand how to create a wallet). Will this make me be judged as cheating or suffer any punishment?

3. Why did the upcoming CodeTON Round disappear? :(

https://mirror.codeforces.com/contest/1175/submission/238928196 For judging whether an array of length n is a 1~n permutation, I judged its sum{i^1} sum{i^2} sum{i^3} sum{i^4} and passed. Can anyone hack this solution or prove it correct? please help me :(