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It also mentions that the difficulty of problems within a same day must increase . So you cannot solve 3 4 5 5 6 in that order on a same day, because you are not increasing difficulty from 5 to 5.
Therefore, I have the same doubt, seems like you need 2 days to solve the second example for me too.
I can only assume that: " Problems with similar vi values are similar in nature" means you can solve all fives at the same time, but that might be stretching it