Joguar: It seems that the S2, T2, R2 line should be marked as correct while others are suboptimal (leading to seki) and should be marked wrong. Either that, or best update the problem header to indicate “no seki”.
posetcay: Seki was accepted because this is an elementary collection, it would be marked as wrong in a more advanced collection.
It seems that the S2, T2, R2 line should be marked as correct while others are suboptimal (leading to seki) and should be marked wrong. Either that, or best update the problem header to indicate “no seki”.