Equal Points are supposed to have equal ranks in long challenge. But there are multiple ranks for 420 points.
Check if they have done the challenge problem or not by checking their profile. If they have done it, then challenge problem gives points upto 10^{-6} but due to constraints, it gets rounded down to 0 in leaderboard.
2 Likes
Oh yes! sorry my bad… actually the attempt was not shown on the rank list.
1 Like