help in a graph problem(bfs)

Правка en1, от abdallah_youssef, 2021-05-21 18:22:38

i don't know how to solve this problem even after i read the editorial, i just understand the bfs part https://codeforces.me/problemset/problem/1037/D

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en1 Английский abdallah_youssef 2021-05-21 18:22:38 184 Initial revision (published)