Can someone explain the solution of SEERC 2020 problem A more precisely?

Правка en1, от QuantumBolt, 2021-07-15 12:25:57

the link of the problem: https://mirror.codeforces.com/gym/103102/problem/A

I guess I have known the general idea of this problem, but I don't know how to solve it practically。 I have read the tutorial, but I can't really understand it. So I hope someone will share your thoughts on this problem.

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en2 Английский QuantumBolt 2021-07-15 12:26:23 9
en1 Английский QuantumBolt 2021-07-15 12:25:57 372 Initial revision (published)