How can i find the observervation in the problem

Правка en1, от amanbora_001, 2024-09-04 20:16:10

i am just grinding a problem ( https://mirror.codeforces.com/contest/1991/problem/C ) and i found that this problem is bit different and how can someone came to this idea. is, this types of patterns repeats or it something else. bit confused...someone help

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en1 Английский amanbora_001 2024-09-04 20:16:10 298 Initial revision (published)