Is this considered as cheating?

Правка en1, от rm-rf, 2021-05-07 23:25:46

I just looked at the scoreboard of round 720 and was surprised by how a Div2 participant (krasav4ik) was able to solve D in 13 minutes. Then I clicked on his submission for D and saw a very different style compared to his previous A, B, C submissions. Take a look at these submissions 115581818, 115571933. I don't think they were written by the same person. Is this behavior considered as cheating?

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  Rev. Язык Кто Когда Δ Комментарий
en2 Английский rm-rf 2021-05-09 01:24:32 214
en1 Английский rm-rf 2021-05-07 23:25:46 474 Initial revision (published)