How to solve Problem G from Codeforces Round 513?

Правка en1, от squarepants, 2020-05-25 19:08:36

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I couldn't find the link for editorial of that contest. I came up with some $$$\mathcal{O}(n^2)$$$ solution but couldn't improve it any further.

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en1 Английский squarepants 2020-05-25 19:08:36 254 Initial revision (published)