Memoisation is a possible approach.

I think it's a bit confusing at least for beginner. But it is a good example for using fallthrough switch.

Any tips, I tried memoization but it turn out to have duplicates problem. I can't get rid of it.

Kotlin Translation here -- Please review and approve

Which language? I don't know if this is my problem too.

Try to write in down and move variable around the equation. I hope this will help.

This is absolutely simple.

Not an issue. Also, all inputs are correct.

My one failed random test, my code return None in some case. Is there any inconsisting whitespace? Such as

"Despair's team :Quaffle , LolHope : Caught snitch"

Edit: I use Python