Help on a problem

Правка en1, от vatsal, 2017-05-14 19:29:46

I am stuck on a problem. I have read the editorial but I am not able to understand it. Can someone please give some other view on the solution or explain the editorial solution in somewhat more detailed way?

Теги #graph, #div2

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en1 Английский vatsal 2017-05-14 19:29:46 271 Initial revision (published)