how to solve this dfs problem

Правка en1, от improvement_19, 2022-02-11 21:36:25

https://codeforces.com/problemset/problem/177/C1 please help how to solve this question thanks in advance

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en2 Английский improvement_19 2022-02-11 21:39:04 11
en1 Английский improvement_19 2022-02-11 21:36:25 138 Initial revision (published)