Can someone help me with this problem C1. Message Transmission Error (hard version)?

Правка en2, от Not_So_Great, 2024-08-29 13:16:41

I have solved the easy version of the problem. But I have no idea how to solve this one. Do I require any new algorithms? Can someone please help me solve this problem?

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en2 Английский Not_So_Great 2024-08-29 13:16:41 6
en1 Английский Not_So_Great 2024-08-29 13:16:24 252 Initial revision (published)