the link of the problem:↵
https://mirror.codeforces.com/gym/103102/problem/A↵
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I guess I have known the general idea of this problem, but I don't know how to solve it practically。↵
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I have read the tutorial, but I can't really understand it.↵
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So I hope someone will share your thoughts on this problem.↵
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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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