Variable obfuscation, he was in my room, couldn't hack them because of it:

• https://codeforces.me/contest/2130/submission/331848121

https://codeforces.me/contest/2130/submission/331853426

• int junk = dummyFn(42, 99); // unused dummy value

Clearly GPT:

• https://codeforces.me/contest/2130/submission/331856195 (six minutes before, WA with no comments)
• https://codeforces.me/contest/2130/submission/331855949
• https://codeforces.me/contest/2130/submission/331854593